A Case Report of Rare Sex Chromosomal Aneuploidy: 48,XXXY/49,XXXXY

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Thank ssx for visiting nature. You are using a browser version with limited support for CSS. Ses obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. Help us improve our products.

Sign up to take part. Sex dimorphism in cell response to stress has previously been investigated by different research groups. This sex could be at least in part accounted for by sex-biased expression of regulatory elements such as microRNAs miRs.

In order to spot previously unknown miR sfx differences we took advantage of prior knowledge on specialized databases to identify X chromosome-encoded miRs potentially escaping X chromosome inactivation XCI. Accordingly, miRam-5p target mRNAs, e. Experimentally induced overexpression of miRam-5p in XY cells by lentivirus vector transduction decreased apoptosis susceptibility, whereas its down-regulation in XX cells enhanced apoptosis susceptibility.

These data indicate that this approach could be used to identify previously unreported sex-biased differences in miR expression and that a miR identified with this approach, miRam-5p, can account for sex-dependent differences observed in the susceptibility to mitochondrial apoptosis of human DFs. A number of diseases have been documented to show a different incidence, progression, and even response to therapy between women and men. Among these are cardiovascular, cancer, metabolic, infectious, or immune diseases 12345.

However, albeit the impact of chromosomal esx has been suggested, relatively few studies have investigated whether sex chromosomes could ssx a role 6. In fact, also the association analyses 4 with more recent DNA sequencing tools have very often neglected to consider the influence of sex, i. The importance of such a field of investigation resides on the idea that the understanding of the mechanisms underlying gender eex could help in our knowledge of the wex mechanisms as well as in the development of the 499 precision medicine 910 Some insights are derived from studies carried out at cellular level, sxe suggested by NIH as necessary step to fill the gap 12 Differences in the behavior of cells from males and females have been investigated in the recent years as concerns their homeostasis.

In particular, a series of studies have been carried out with the aim of deciphering whether a disparity in the response to stress could take place in cells coming sxe males and females.

XX and XY cells, independently from their origin e. Hence, as a general rule, under the same stress, e. In all these pathologic conditions cell homeostasis of lymphocytes, vessel or cardiac cells, neuronal cells, cancer cellsi. Evidence is accumulating for a sex-biased expression of regulatory elements such as microRNA miRs across a variety of tissues that could have functional implications 23 The reasons for such differences sex at present not totally clear.

One straight-forward hypothesis is that some of them are encoded in sex chromosomes. However, it is well known that a number of X-linked genes escape X chromosome inactivation XCI 2627 A systematic bioinformatic analysis of these genes has not been performed, due to the extremely heterogeneous scenario of XCI escaper genes may display different levels of expression between tissues and subjects However, incomplete XCI has been proposed as a mechanism that can introduce phenotypic diversity 31 In the same vein, it has been proposed that some of the X-linked miRs may escape XCI as well, and can be differently expressed in XX and XY cells, thus accounting at least partially for the observed sex-dependent differences in immune and stress responses In particular, some miRs are actually coded within the body of escaper genes ssex are sed likely to be regulated in the same way.

We therefore performed an extensive data exploration via specialised and cross-linked databases to identify miRs differentially expressed between XX and Sfx cells that can account for cell-sex disparity. In particular, i we identified genes that always appear to escape XCI in many different tissues; ii we investigated the presence of miRs within the region of such genes; iii 499 extracted from databases the experimentally validated targets of these miRs and performed a pathway enrichment; iv we experimentally tested the results by checking with quantitative real-time PCR the expression of selected target genes, as well as their biologic functional effects sex cell fate; and finally v performed overexpression and silencing experiments of the identified miR am-5p to validate its possible role in sex-specific phenotypic difference.

In the above-mentioned papers, genes are defined as follows. According to the work of Carrel and Willard 26 and its Supplementary Table S3genes escaping X inactivation are expressed in at least 7 out of the 9 hybrid cell lines tested genes expressed in 0 to 2 out of 9 hybrid lines tested are X inactivated; genes expressed in sec to 94 out of 9 hybrid lines tested are subject to variable escape. In the 4 of Cotton et al. According to the above definitions and data, we found 99 escaper genes IDs in the analyses of Carrel and Willard.

Twenty-three escaper genes sxe shared between the two datasets intersectionwhile escaper genes appear at least in one of the two datasets union; Table Seex. Analysis performed sex the genes defined as XCI escaper in either the Carrell dataset or the Cotton sdx identified 6 genes that contain 12 miRs in their chromosomic loci Table 1according to the host gene-miRNA mapping services.

Table S5. We finally obtained the list of escaper genes hosting an miR in their locus Table S6. Since for further biological validation 449 we decided to use primary sfx fibroblasts DFswe took advantage of the dataset by Tukiainen et al.

From our previous data, XX and XY cells differ in terms of susceptibility to apoptosis 133738 thus we focused our attention on this aspect. According to the database Tarbase 8.

Pathway analysis carried out with the same knowledgebase via mirPath v. On the same database Tarbase 8. Therefore, miRam-5p seemed a good candidate to explain the sex-specific difference in susceptibility to apoptosis and 449 therefore selected for further analyses.

Two additional X chromosome miRs present in loci subject to XCI were also selected as negative controls: miRc and miRax this latter belonging to the same family of miRam-5p. Primary DF cultures were available at the bio-bank of esx laboratory and were established from biopsies of sun-protected forearm skin according to standard culture methods. All the donors gave their informed consent before biopsy was performed.

In total, 16 subjects were studied: 8 female donors The results obtained were completely overlapping data not shown. Therefore, on these bases, the whole study was carried out by using non-charcodylated serum.

Threshold cycle Ct and baselines were determined by manual settings. In these cells, gag-pol genes are expressed under control of an ecdysone-inducible promoter, so that the lentiviral particle production requires cell stimulation with the ecdysone analog ponasterone A PonA. Twenty hours later, supernatants were replaced with fresh sex containing the inducers.

DFs from four male donors were transduced sxe overexpress miRam-5p and four female donors were transduced to downregulate miRam-5p. Harvested zex were examined for transduction efficiency by flow cytometer analysis esx quantification of GFP-positive cells.

Either Ses or -positive cells were subsequently analyzed for miRam-5p level, Bax and Bcl-2 expression, and apoptotic susceptibility. All chemicals were the highest grade available from Sigma-Aldrich St. DHR dye freely diffuses into cells and is primarily oxidized by H 2 O 2 producing green fluorescence.

Cells were then washed in phosphate-buffered saline PBS and immediately analyzed on a cytometer. Cell samples were washed twice in PBS and immediately analyzed on a cytometer. For flow cytometry studies, where not otherwise specified, samples sex analyzed with a FACScalibur cytometer BD Biosciences equipped with a argon laser and with a red diode laser. At least 30, events were acquired.

The expression level of the analyzed proteins was expressed as median fluorescence. Based on the bioinformatic analysis described in Materials and methods, miRam-5p resulted possibly expressed at different levels in XX and XY cells. Two additional miRs, miR23c and miRax, were considered as controls. These three miRs regulate a number of geneslisted in Table S5in particular miRax and miRam-5p regulate some genes that are involved in very important pathways affecting cell fate, such as p53 pathway, apoptosis, and protein ubiquitination Table Sex.

To test whether the prediction of our in silico analysis was correct, we tested the expression of these three miRs by qRT-PCR sdx primary DFs from eight male and eight female subjects.

The results shown in Fig. To further test whether this differential expression may have sex effect on apoptosis susceptibility, we investigated ssex expression of specific target genes of miRam-5p. As shown ses Fig. In contrast, significant sex-related differences in the expression levels of Bax and Bcl-2 proteins were detected.

The fold increase values were obtained from eight female and eight male donors estimated sez two independent quantitation reactions, with triplicate wells for each sample and for each microRNA. No statistically significant differences were evident between male and female DFs. Right panels: Cytofluorimetric histograms of mitochondrial ROS evaluation obtained in two representative male and female DFs. Anti-apoptotic proteins such as Bcl-2 bind and sequester pro-apoptotic proteins, including Bax, to regulate the mitochondrial pathway of apoptosis, by controlling the permeabilization of the outer mitochondrial membrane sex In particular, after CHX administration we found 7.

Interestingly, a similar sex difference was found when a different sed stimulation was used, i. Numbers represent the percentages of Annexin V-positive cells. Collectively these results indicated that male derived DFs were ssex prone to mitochondria-mediated apoptosis than female ones. In order to verify whether the above-mentioned biological differences could be due to the different levels of miRam-5p, we overexpressed this miR in DFs isolated from four different sez subjects, by transduction with GFP-miRam-5p-carrying lentivirus.

An average of Upon transduction, the miRam-5p level increased by almost four times with respect to the GFP-negative controls and by 1. In parallel, we evaluated by flow cytometry the levels of Bax and Bcl-2 94 in both GFP-positive and -negative cells.

In Fig. S2 the analyses obtained in a second, independent round of experiments using DFs isolated from three additional male subjects are reported. In few words, the overexpression of miRam-5p in XY cells leads to an increased resistance to apoptotic cell death, thus reverting the natural proneness of XY cells to undergo apoptosis. Numbers indicate the percentage of GFP-positive cells. Numbers indicate the median fluorescence intensity.

Numbers represent the percentages of annexin V-positive cells. These experiments were carried out in cells pre-treated or not sx AZT. Consistently with previous reports 43transduction efficiency of XX DFs was significantly lower than that observed in XY ones Figure S 3 shows the analyses sex in a second, independent round of experiments using DFs isolated from three additional female subjects.

In few words, the down-regulation of miRam-5p in XX cells leads to an increased susceptibility to apoptotic cell death, reverting the natural attitude of XX cells to be resistant to apoptotic stimulus. Sexual dimorphism is ubiquitous across vertebrates, in which both sexes exhibit differences in behavioral, morphological, and physiological trait.

In fact, most of the phenotypic differences are caused by a sex-biased expression of genes 45which can depend on their regulation at the transcriptional and post-transcriptional levels, and regulators such as miRs are reported to have important roles in this process MiRs sexx endogenous small non-coding RNAs with a total length of about 19—25 nucleotides that exert a wide range of biological functions in different cellular processes, including differentiation, proliferation, metabolism, and apoptosis.

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Although sexual intercourse , sex and "having sex" also most commonly denote penile—vaginal intercourse, [26] sex can be significantly broad in its meaning and may cover any penetrative or non-penetrative sexual activity between two or more people.

Vaginal, anal and oral sex are recognized as sexual intercourse more often than other sexual behaviors. Researchers commonly use sexual intercourse to denote penile—vaginal intercourse while using specific words, such as anal sex or oral sex , for other sexual behaviors.

Lerner and Laurence Steinberg state that researchers also "rarely disclose" how they conceptualize sex "or even whether they resolved potential discrepancies" in conceptualizations of sex. Studies regarding the meaning of sexual intercourse sometimes conflict. While most consider penile—vaginal intercourse to be sex, whether anal or oral intercourse are considered sex is more debatable, with oral sex ranking lowest.

Sexual intercourse or other sexual activity can encompass various sexually stimulating factors physiological stimulation or psychological stimulation , including different sex positions such as the missionary position , the most common human sex position or the use of sex toys. Non- primate females copulate only when in estrus , [53] but sexual intercourse is possible at any time of the menstrual cycle for women.

During coitus, the partners orient their hips to allow the penis to move back and forth in the vagina to cause friction, typically without fully removing the penis. In this way, they stimulate themselves and each other, often continuing until orgasm in either or both partners is achieved. Anal sex involves stimulation of the anus , anal cavity, sphincter valve or rectum ; it most commonly means the insertion of a man's penis into another person's rectum, but may also mean the use of sex toys or fingers to penetrate the anus, or oral sex on the anus anilingus , or pegging.

Oral sex consists of all the sexual activities that involve the use of the mouth and throat to stimulate genitalia or anus. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen during fellatio or vaginal fluids during cunnilingus. Fingering or digital penetration or digital intercourse involves the manual manipulation of the clitoris, rest of the vulva , vagina or anus for the purpose of sexual arousal and sexual stimulation; it may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities.

Natural human reproduction involves penile—vaginal penetration, [70] during which semen , containing male gametes known as sperm cells or spermatozoa, is expelled via ejaculation through the penis into the vagina. The sperm passes through the vaginal vault , cervix and into the uterus , and then into the fallopian tubes.

Millions of sperm are present in each ejaculation to increase the chances of fertilization see sperm competition , but only one reaching an egg or ovum is sufficient to achieve fertilization. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo. When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins.

Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation. When a sperm donor has sexual intercourse with a woman who is not his partner and for the sole purpose of impregnating the woman, this may be known as natural insemination , as opposed to artificial insemination.

Artificial insemination is a form of assisted reproductive technology , which are methods used to achieve pregnancy by artificial or partially artificial means. For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy.

There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts, [12] [81] and heterosexual couples may use oral or anal sex or both as a means of birth control.

Safe sex is a relevant harm reduction philosophy [86] and condoms are used as a form of safe sex and contraception. Condoms are widely recommended for the prevention of sexually transmitted infections STIs. Decisions and options concerning birth control can be affected by cultural reasons, such as religion, gender roles or folklore. Penile—vaginal penetration is the most common form of sexual intercourse. Bruess et al. Regarding oral or anal intercourse, the CDC stated in , "Studies indicate that oral sex is commonly practiced by sexually active male-female and same-gender couples of various ages, including adolescents.

The prevalence of sexual intercourse has been compared cross-culturally. In the second group, the data indicated families encouraged daughters to delay marriage, and to abstain from sexual activity before that time. However, sons are encouraged to gain experience with older women or prostitutes before marriage.

Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe Portugal, Greece and Romania are noted and from Latin America Brazil, Chile , and the Dominican Republic.

The study considered many Asian societies to also fall into this group, although matching data was only available from Thailand. In the third group, age of men and women at sexual initiation was more closely matched; there were two sub-groups, however.

In non-Latin, Catholic countries Poland and Lithuania are mentioned , age at sexual initiation was higher, suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected in Singapore and Sri Lanka.

The study considered China and Vietnam to also fall into this group, though data were not available. Concerning United States data, tabulations by the National Center for Health Statistics report that the age of first sexual intercourse was In humans, sexual intercourse and sexual activity in general have been reported as having health benefits as varied as increased immunity by increasing the body's production of antibodies and subsequent lower blood pressure , [99] [] and decreased risk of prostate cancer.

Sexually transmitted infections STIs are bacteria , viruses or parasites that are spread by sexual contact, especially vaginal, anal, or oral intercourse, or unprotected sex. There are 19 million new cases of sexually transmitted infections every year in the U. Of the 2. The World Health Organization also stated that the "estimated 1.

In cases where infection is suspected, early medical intervention is highly beneficial in all cases. They added that "several co-factors may increase the risk of HIV transmission through oral sex"; this includes ulcers, bleeding gums , genital sores, and the presence of other STIs.

In , the World Health Organization estimated that million women become pregnant worldwide each year, and around 87 million of those pregnancies or Approximately 46 million pregnancies per year reportedly end in induced abortion. However, many more women become pregnant and miscarry without even realizing it, instead mistaking the miscarriage for an unusually heavy menstruation.

This data includes live births, abortions, and fetal losses. It has been linked to atypical levels of dopamine, a neurotransmitter. This behavior is characterized by a fixation on sexual intercourse and disinhibition. It was proposed that this 'addictive behavior' be classified in DSM-5 as an impulsive—compulsive behavioral disorder.

Addiction to sexual intercourse is thought to be genetically linked. Those having an addiction to sexual intercourse have a higher response to visual sexual cues in the brain. Those seeking treatment will typically see a physician for pharmacological management and therapy. It is manifested by hypersomnia and hypersexuality and remains relatively rare. Sexual activity can directly cause death , particularly due to coronary circulation complications, which is sometimes called coital death, coital sudden death or coital coronary.

Sexual intercourse, when involving a male participant, often ends when the male has ejaculated, and thus the partner might not have time to reach orgasm. In , scholars from the Kinsey Institute stated, "The truth is that the time between penetration and ejaculation varies not only from man to man, but from one time to the next for the same man.

But he didn't ask if the men or their partners considered two minutes mutually satisfying" and "more recent research reports slightly longer times for intercourse". Anorgasmia is regular difficulty reaching orgasm after ample sexual stimulation, causing personal distress.

Vaginismus is involuntary tensing of the pelvic floor musculature, making coitus, or any form of penetration of the vagina, distressing, painful and sometimes impossible for women. It is a conditioned reflex of the pubococcygeus muscle, and is sometimes referred to as the PC muscle. Vaginismus can be hard to overcome because if a woman expects to experience pain during sexual intercourse, this can cause a muscle spasm, which results in painful sexual intercourse.

For those whose impotence is caused by medical conditions, prescription drugs such as Viagra , Cialis , and Levitra are available. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack.

Sexual intercourse remains possible after major medical treatment of the reproductive organs and structures. This is especially true for women. Even after extensive gynecological surgical procedures such as hysterectomy , oophorectomy , salpingectomy , dilation and curettage , hymenotomy , Bartholin gland surgery, abscess removal, vestibulectomy , labia minora reduction, cervical conization , surgical and radiological cancer treatments and chemotherapy , coitus can continue. Reconstructive surgery remains an option for women who have experienced benign and malignant conditions.

Obstacles that those with disabilities face with regard to engaging in sexual intercourse include pain, depression , fatigue, negative body image , stiffness, functional impairment, anxiety, reduced libido , hormonal imbalance, and drug treatment or side effects. Sexual functioning has been regularly identified as a neglected area of the quality of life in patients with rheumatoid arthritis.

The mentally disabled also are subject to challenges in participating in sexual intercourse. Women with Intellectual disabilities ID are often presented with situations that prevent sexual intercourse.

This can include the lack of a knowledgeable healthcare provider trained and experienced in counseling those with ID on sexual intercourse. Those with ID may have hesitations regarding the discussion of the topic of sex, a lack of sexual knowledge and limited opportunities for sex education. In addition there are other barriers such as a higher prevalence of sexual abuse and assault.

These crimes often remain underreported. There remains a lack of "dialogue around this population's human right to consensual sexual expression, undertreatment of menstrual disorders, and legal and systemic barriers". Women with ID may lack sexual health care and sex education.

They may not recognize sexual abuse. Consensual sexual intercourse is not always an option for some. Those with ID may have limited knowledge and access to contraception, screening for sexually transmitted infections and cervical cancer.

Sexual intercourse may be for reproductive, relational, or recreational purposes. In humans and bonobos , the female undergoes relatively concealed ovulation so that male and female partners commonly do not know whether she is fertile at any given moment.

One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual partners important for social interactions and, in the case of humans, long-term partnership rather than immediate sexual reproduction.

Sexual dissatisfaction due to the lack of sexual intercourse is associated with increased risk of divorce and relationship dissolution, especially for men. For women, there is often a complaint about the lack of their spouses' sexual spontaneity.

Decreased sexual activity among these women may be the result of their perceived failure to maintain ideal physical attractiveness or because their sexual partners' health issues have hindered sexual intercourse.

Research additionally indicates that non-married couples who are cohabiting engage in sexual intercourse more often than married couples, and are more likely to participate in sexual activity outside of their sexual relationships; this may be due to the " honeymoon " effect the newness or novelty of sexual intercourse with the partner , since sexual intercourse is usually practiced less the longer a couple is married, with couples engaging in sexual intercourse or other sexual activity once or twice a week, or approximately six to seven times a month.

Adolescents commonly use sexual intercourse for relational and recreational purposes, which may negatively or positively impact their lives. For example, while teenage pregnancy may be welcomed in some cultures, it is also commonly disparaged, and research suggests that the earlier onset of puberty for children puts pressure on children and teenagers to act like adults before they are emotionally or cognitively ready.

Some studies from the s through s suggested an association between self-esteem and sexual intercourse among adolescents, [] while other studies, from the s and s, reported that the research generally indicates little or no relationship between self-esteem and sexual activity among adolescents. Psychiatrist Lynn Ponton wrote, "All adolescents have sex lives, whether they are sexually active with others, with themselves, or seemingly not at all", and that viewing adolescent sexuality as a potentially positive experience, rather than as something inherently dangerous, may help young people develop healthier patterns and make more positive choices regarding sexual activity.

High-quality romantic relationships are associated with higher commitment in early adulthood, [] and are positively associated with social competence.

While sexual intercourse, as coitus, is the natural mode of reproduction for the human species, humans have intricate moral and ethical guidelines which regulate the practice of sexual intercourse and vary according to religious and governmental laws. Some governments and religions also have strict designations of "appropriate" and "inappropriate" sexual behavior, which include restrictions on the types of sex acts which are permissible.

A historically prohibited or regulated sex act is anal sex. Sexual intercourse with a person against their will, or without their consent , is rape , but may also be called sexual assault ; it is considered a serious crime in most countries.

Most countries have age of consent laws which set the minimum legal age with whom an older person may engage in sexual intercourse, usually set at 16 to 18, but ranges from 12 to 20, years of age.

In some societies, an age of consent is set by non-statutory custom or tradition. Some countries treat any sex with a person of diminished or insufficient mental capacity to give consent, regardless of age, as rape. Robert Francoeur et al. Kalbfleisch and Michael J. Over time, the meaning of rape broadened in some parts of the world to include many types of sexual penetration, including anal intercourse, fellatio, cunnilingus, and penetration of the genitals or rectum by an inanimate object.

In , they changed the meaning from "The carnal knowledge of a female forcibly and against her will" to "The penetration, no matter how slight, of the vagina or anus with any body part or object, or oral penetration by a sex organ of another person, without the consent of the victim. In most societies around the world, the concept of incest exists and is criminalized.

James Roffee, a senior lecturer in criminology at Monash University , [] addressed potential harm associated with familial sexual activity, such as resulting children born with deficiencies. However, the law is more concerned with protecting the rights of people who are potentially subjected to such abuse.

This is why familial sexual relationships are criminalized, even if all parties are consensual. There are laws prohibiting all kinds of sexual activity between relatives, not necessarily penetrative sex. These laws refer to grandparents, parents, children, siblings, aunts and uncles. There are differences between states in terms of the severity of punishments and what they consider to be a relative, including biological parents, step-parents, adoptive parents and half-siblings.

Another sexual matter concerning consent is zoophilia , which is a paraphilia involving sexual activity between human and non-human animals, or a fixation on such practice. Sexual intercourse has traditionally been considered an essential part of a marriage, with many religious customs requiring consummation of the marriage and citing marriage as the most appropriate union for sexual reproduction procreation.

Sexual relations between marriage partners have been a "marital right" in various societies and religions, both historically and in modern times, especially with regard to a husband's rights to his wife.

Adultery engaging in sexual intercourse with someone other than one's spouse has been, and remains, a criminal offense in some jurisdictions. With regard to divorce laws , the refusal to engage in sexual intercourse with one's spouse may give rise to a grounds for divorce , which may be listed under "grounds of abandonment".

Dwyer stated that no-fault divorce laws "have made it much easier for a woman to exit a marital relationship, and wives have obtained greater control over their bodies while in a marriage" because of legislative and judicial changes regarding the concept of a marital exemption when a man rapes his wife. There are various legal positions regarding the meaning and legality of sexual intercourse between persons of the same sex or gender.

Blanchflower , it was held that female same-sex sexual relations, and same-sex sexual practices in general, did not constitute sexual intercourse, based on a entry in Webster's Third New International Dictionary that categorizes sexual intercourse as coitus; and thereby an accused wife in a divorce case was found not guilty of adultery.

Opposition to same-sex marriage is largely based on the belief that sexual intercourse and sexual orientation should be of a heterosexual nature. A related issue is whether the word marriage should be applied. There are wide differences in religious views with regard to sexual intercourse in or outside of marriage:. In some cases, the sexual intercourse between two people is seen as counter to religious law or doctrine. In many religious communities, including the Catholic Church and Mahayana Buddhists , religious leaders are expected to refrain from sexual intercourse in order to devote their full attention, energy, and loyalty to their religious duties.

In zoology , copulation often means the process in which a male introduces sperm into the female's body, especially directly into her reproductive tract. Before mating and copulation, the male spider spins a small web and ejaculates on to it. He then stores the sperm in reservoirs on his large pedipalps , from which he transfers sperm to the female's genitals.

The females can store sperm indefinitely. Many animals that live in water use external fertilization , whereas internal fertilization may have developed from a need to maintain gametes in a liquid medium in the Late Ordovician epoch. Internal fertilization with many vertebrates such as reptiles , some fish , and most birds occur via cloacal copulation see also hemipenis , while mammals copulate vaginally, and many basal vertebrates reproduce sexually with external fertilization.

For primitive insects , the male deposits spermatozoa on the substrate, sometimes stored within a special structure; courtship involves inducing the female to take up the sperm package into her genital opening, but there is no actual copulation. In dragonflies, it is a set of modified sternites on the second abdominal segment. Bonobos, chimpanzees and dolphins are species known to engage in heterosexual behaviors even when the female is not in estrus, which is a point in her reproductive cycle suitable for successful impregnation.

These species are also known to engage in same-sex sexual behaviors. From Wikipedia, the free encyclopedia. This article is primarily about humans. For other animals, see Animal sexual behaviour. For other uses, see Sex disambiguation. For copulation among other animals, see Copulation zoology. Copulation for reproduction or sexual pleasure, or other penetrative sex acts for sexual pleasure.

See also: Human sexual activity and Human sexuality. Main articles: Sexual reproduction and Human reproduction. See also: Coitus interruptus. See also: Intravaginal ejaculation latency time and Coitus reservatus. Main article: Sexuality and disability. See also: Human mating strategies and Pair bond.

Main article: Adolescent sexuality. See also: Sexual ethics , Religion and sexuality , and Sex and the law. See also: Religion and sexuality. Main articles: Copulation zoology and Animal sexual behaviour. See also: Sexual coercion. Human sexuality portal. See, for example; "Sexual intercourse". Retrieved November 22, Retrieved December 5, Retrieved May 9, Richard M. Lerner ; Laurence Steinberg Handbook of Adolescent Psychology. Retrieved April 29, Encyclopedia of Sex and Gender: A-C.

Macmillan Reference. Sexual intercourse. This 'coming together' is generally understood in heteronormative terms as the penetration of a woman's vagina by a man's penis. Irving B. Weiner; W. Edward Craighead The Corsini Encyclopedia of Psychology.

Retrieved August 21, Human sexual intercourse, or coitus, is one of the most common sexual outlets among adults. Sexual intercourse generally refers to penile penetration of the vagina. Clint E. Bruess; Elizabeth Schroeder Sexuality Education Theory and Practice. In many cultures around the world, vaginal sex is what is usually implied when people refer to 'having sex' or 'sexual intercourse.

Cecie Starr; Beverly McMillan Human Biology. Cengage Learning. Retrieved December 27, Coitus and copulation are both technical terms for sexual intercourse. The male sex act involves an erection, in which the limp penis stiffens and lengthens. It also involves ejaculation, the forceful expulsion of semen into the urethra and out from the penis. The stimulation triggers rhythmic, involuntary contractions in smooth muscle in the male reproductive tract, especially the vas deferens and the prostate.

The contractions rapidly force sperm out of each epididymis. They also force the contents of seminal vesicles and the prostate gland into the urethra. The resulting mixture, semen, is ejaculated into the vagina. Janell L. Carroll Sexuality Now: Embracing Diversity. Vaginal intercourse also referred to as sexual intercourse involves inserting the penis into the vagina. Essential Concepts for Healthy Living. Most heterosexuals are familiar with the notion of 'having sex' or sexual intercourse as vaginal sex, the insertion of a penis into a vagina.

Vaginal sex, or coitus, is the most common and popular form of intimate sexual activity between partners. Archived from the original on August 22, Retrieved January 12, Human Sexuality in a World of Diversity. Discovering Biological Psychology. World Health Organization. January Retrieved September 5, In English, the term 'sex' is often used to mean 'sexual activity' and can cover a range of behaviours.

Other languages and cultures use different terms, with slightly different meanings. Nancy W. Denney; David Quadagno Human Sexuality.

Mosby-Year Book. Although the term intercourse is usually used to refer to the insertion of the penis into the vagina, it is also used to refer to oral intercourse or anal intercourse in which the penis is inserted into the mouth or the anus, respectively.

Dianne Hales Brief Edition 3rd ed. The Encyclopedia of Mental Health. Infobase Publishing. An Invitation to Health Brief — Sexually Transmitted Infections. Elsevier Health Sciences. Carpenter LM NYU Press. Retrieved October 8, Most people agree that we maintain virginity as long as we refrain from sexual vaginal intercourse. But occasionally we hear people speak of 'technical virginity' [ Advanced biology. Oxford University Press. Retrieved October 21, Pearson Education India.

Petri, John M. Govern Motivation: Theory, Research, and Application. Trends Ecol. Palgrave Macmillan. Fedwa Malti-Douglas Ada P. Kahn; Jan Fawcett Carroll JL Discovery Series: Human Sexuality 1st ed. Health and Wellness for Life.

Human Kinetics. Retrieved September 6, Retrieved August 23, Retrieved August 24, The widespread, unquestioned equation of penile—vaginal intercourse with sex reflects a failure to examine systematically 'whether the respondent's understanding of the question matches what the researcher had in mind. Laura M. Carpenter In many cultures around the world, vaginal sex is what is usually implied when people refer to 'having sex' or 'sexual intercourse'.

It is the most frequently studied behavior and is often the focus of sexuality education programming for youth. Retrieved March 30, Retrieved December 26, Concise Medical Dictionary. Retrieved July 4, Journal of Pediatric and Adolescent Gynecology.

Harvey B. Milkman; Kenneth W. Wanberg Retrieved October 9, Cohen But occasionally we hear people speak of 'technical virginity' Data indicate that 'a very significant proportion of teens ha[ve] had experience with oral sex, even if they haven't had sexual intercourse, and may think of themselves as virgins'. Robert Crooks; Karla Baur Our Sexuality.

Noncoital forms of sexual intimacy, which have been called outercourse, can be a viable form of birth control. Outercourse includes all avenues of sexual intimacy other than penile—vaginal intercourse, including kissing, touching, mutual masturbation, and oral and anal sex. UD, TK Like a Virgin. The Advocate. Here Publishing. Retrieved March 13, Retrieved February 12, Exploring the Dimensions of Human Sexuality. McAnulty; M. Michele Burnette Andrew Baum; Tracey A.

Revenson; Jerome Singer Handbook of Health Psychology 2nd ed. Psychology Press. Having started with a discussion of penile-vaginal intercourse as the act that designates sexual initiation, as defined in most studies, we would like to undercut that position by stressing the need to define sex more broadly. Retrieved April 30, Gender Power and Communication in Human Relationships.

June Archived from the original PDF on May 10, Retrieved August 30, The Epidemic: A History of Aids. Many men simply did not like the feel of condoms, or associated them with emasculation.

They say, 'Unless it's flesh on flesh, it's not real sex Wekwete African Books Collective. Lloyd; Dana S. Dunn; Elizabeth Yost Hammer When a man puts pop-rocks inside a woman's vagina and then proceeds to have sex with her, delivering a pleasurable sensation to both member's genitals.

The term is derived from the " 49ers " who prospected rocks in San Francisco in Man 1: Check out the freak over there--I bet she's down to do the weird stuff. Man 2: Dude, she's totally DT An oral sex position " blow-job ". Derived from 69 and appearance of the numbers.

Gal : I like Guy: I like Gal: What's that? Guy: It's like 69 but non-symbiotic. Gal: But I want to be on the receiving end! Guy: Everyone does. Slang for sex with a quadroplegic. I totally just ed with that dude in a wheel chair. Belted Eraser Jekyll

sex 49

Sexual intercourse or coitus or copulation is sexual activity typically involving the insertion and thrusting of the penis into the vagina for sexual pleasurereproductionor both.

There are different views on what constitutes sexual intercourse or other sexual activitywhich can impact on views on sexual health. Various jurisdictions place restrictions on certain sexual acts, such as incestsexual activity with minorsprostitutionrapezoophiliasodomypremarital and extramarital sex. Religious beliefs also play a role in personal decisions about sexual intercourse or other sexual activity, such as decisions about virginity[13] [14] or legal and public policy matters.

Religious views on sexuality vary significantly between different religions and sects of the same religion, though there are common themes, such as prohibition of adultery. Reproductive sexual intercourse between non-human animals is more often called copulationand sperm may be introduced into the female's reproductive tract in non-vaginal ways among the animals, such as by cloacal copulation.

For most non-human mammalsmating and copulation occur at the point of estrus the most fertile period of time in the female's reproductive cyclewhich increases the chances of successful impregnation. Sexual intercourse may be called coituscopulationcoitionor intercourse the last of which is typically shorthand for sexual intercourse. Coitus is derived from the Latin word coitio or coiremeaning "a coming together or joining together" or "to go together", and is known under different ancient Latin names for a variety of sexual activities, but usually denotes penile—vaginal penetration.

Although sexual intercoursesex and "having sex" also most commonly denote penile—vaginal intercourse, [26] sex can be significantly broad in its meaning and may cover any penetrative or non-penetrative sexual activity between two or more people. Vaginal, anal and oral sex are recognized as sexual intercourse more often than other sexual behaviors.

Researchers commonly use sexual intercourse to denote penile—vaginal intercourse while using specific words, such as anal sex or oral sexfor other sexual behaviors. Lerner and Laurence Steinberg state that researchers also "rarely disclose" how they conceptualize sex "or even whether they resolved potential discrepancies" in conceptualizations of sex.

Studies regarding the meaning of sexual intercourse sometimes conflict. While most consider penile—vaginal intercourse to be sex, whether anal or oral intercourse are considered sex is more debatable, with oral sex ranking lowest. Sexual intercourse or other sexual activity can encompass various sexually stimulating factors physiological stimulation or psychological stimulationincluding different sex positions such as the missionary positionthe most common human sex position or the use of sex toys.

Non- primate females copulate only when in estrus[53] but sexual intercourse is possible at any time of the sex cycle for women. During coitus, the partners orient their hips to allow the penis to move back and forth in the vagina to cause friction, typically without fully removing the penis. In this way, they stimulate themselves and each other, often continuing until orgasm in either or both partners is achieved. Anal sex involves stimulation of the anusanal cavity, sphincter valve or rectum ; it most commonly means the insertion of a man's penis into another person's rectum, but may also mean the use of sex toys or fingers to penetrate the anus, or oral sex on the anus anilingusor pegging.

Oral sex consists of all the sexual activities that involve the use of the mouth and throat to stimulate genitalia or anus. It is sometimes performed to the exclusion of all other forms of sexual activity, and may include the ingestion or absorption of semen during fellatio or vaginal fluids during cunnilingus. Fingering or digital penetration or digital intercourse involves the manual manipulation of the clitoris, rest of the vulvavagina or anus for the purpose of sexual arousal and sexual stimulation; it may constitute the entire sexual encounter or it may be part of mutual masturbation, foreplay or other sexual activities.

Natural human reproduction involves penile—vaginal penetration, [70] during which semencontaining male gametes known as sperm cells or spermatozoa, is expelled via ejaculation through the penis into the vagina.

The sperm passes through the vaginal vaultcervix and into the uterusand then into the fallopian tubes. Millions of sperm are present in each ejaculation to increase the chances of fertilization see sperm competitionbut only one reaching an egg or ovum is sufficient to achieve fertilization. When a fertile ovum from the female is present in the fallopian tubes, the male gamete joins with the ovum, resulting in fertilization and the formation of a new embryo.

When a fertilized ovum reaches the uterus, it becomes implanted in the lining of the uterus the endometrium and a pregnancy begins. Pregnancy rates for sexual intercourse are highest during the menstrual cycle time from some 5 days before until 1 to 2 days after ovulation.

When a sperm donor has sexual intercourse with a woman who is not his partner and for the sole purpose of impregnating the woman, this may be known as natural inseminationas opposed to artificial insemination. Artificial insemination is a form of assisted reproductive technologywhich are methods used to achieve pregnancy by artificial or partially artificial means.

For gay male pairings, there is the option of surrogate pregnancy; for lesbian couples, there is donor insemination in addition to choosing surrogate pregnancy. There are a variety of safe sex methods that are practiced by heterosexual and same-sex couples, including non-penetrative sex acts, [12] [81] and heterosexual couples may use oral or anal sex or both as a means of birth control.

Safe sex is a relevant harm reduction philosophy [86] and condoms are used as a form of safe sex and contraception. Condoms are widely recommended for the prevention of sexually transmitted infections STIs. Decisions and options concerning birth control can be affected by cultural reasons, such as religion, gender roles or folklore.

Penile—vaginal penetration is the most common form of sexual intercourse. Bruess et al. Regarding oral or anal intercourse, the CDC stated in"Studies indicate that oral sex is commonly practiced by sexually active male-female and same-gender couples of various ages, including adolescents. The prevalence of sexual intercourse has been sex cross-culturally. In the second group, the data indicated families encouraged daughters to delay marriage, and to abstain from sexual activity before that time.

However, sons are encouraged to gain experience with older women or prostitutes before marriage. Age of men at sexual initiation in these societies is at lower ages than that of women; this group includes Latin cultures, both from southern Europe Portugal, Greece and Romania are sex and from Latin America Brazil, Chileand the Dominican Republic.

The study considered many Asian societies to also fall into this group, although matching data was only available from Thailand. In the third group, age of men and women at sexual initiation was more closely matched; there were two sub-groups, however.

In non-Latin, Catholic countries Poland and Lithuania are mentionedage at sexual initiation was higher, suggesting later marriage and reciprocal valuing of male and female virginity. The same pattern of late marriage and reciprocal valuing of virginity was reflected in Singapore and Sri Lanka.

The study considered China and Vietnam to also fall into this group, though data were not available. Concerning United States data, tabulations by the National Center for Health Statistics report that the age of first sexual intercourse was In humans, sexual intercourse and sexual activity in general have been reported as having health benefits as varied as increased immunity by increasing the body's production of antibodies and subsequent lower blood pressure[99] [] and decreased risk of prostate cancer.

Sexually transmitted infections STIs are bacteriaviruses or parasites that are spread by sexual contact, especially vaginal, anal, or oral intercourse, or unprotected sex. There are 19 million new cases of sexually transmitted infections every year in the U. Of the 2. The World Health Organization also stated that the "estimated 1.

In cases where infection is suspected, early medical intervention is highly beneficial in all cases. They added that "several co-factors may increase the risk of HIV transmission through oral sex"; this includes ulcers, bleeding gumsgenital sores, and the presence of other STIs. Inthe World Health Organization estimated that million women become pregnant worldwide each year, and around 87 million of those pregnancies or Approximately 46 million pregnancies per year reportedly end in induced abortion.

However, many more women become pregnant and miscarry without even realizing it, instead mistaking the miscarriage for an unusually heavy menstruation. This data includes live births, abortions, and fetal losses. It has been linked to atypical levels of dopamine, a neurotransmitter. This behavior is characterized by a fixation on sexual intercourse and disinhibition.

It was proposed that this 'addictive behavior' be classified in DSM-5 as an impulsive—compulsive behavioral disorder. Addiction to sexual intercourse is thought to be genetically linked. Those having an addiction to sexual intercourse have a higher response to visual sexual cues in the brain.

Those seeking treatment will typically see a physician for pharmacological management and therapy. It is manifested by hypersomnia and hypersexuality and remains relatively rare. Sexual activity can directly cause deathparticularly due to coronary circulation complications, which is sometimes called coital death, coital sudden death or coital coronary.

Sexual intercourse, when involving a male participant, often ends when the male has ejaculated, and thus the partner might not have time to reach orgasm. Inscholars from the Kinsey Institute stated, "The truth is that the time between penetration and ejaculation varies not only from man to man, but from one time to the next for the same man. But he didn't ask if the men or their partners considered two minutes mutually satisfying" and "more recent research reports slightly longer times for intercourse".

Anorgasmia is regular difficulty reaching orgasm after ample sexual stimulation, causing personal distress. Vaginismus is involuntary tensing of the pelvic floor musculature, making coitus, or any form sex penetration of the vagina, distressing, painful and sometimes impossible for women. It is a conditioned reflex of the pubococcygeus muscle, and is sometimes referred to as the PC muscle. Vaginismus can be hard to overcome because if a woman expects to experience pain during sexual intercourse, this can cause a muscle spasm, which results in painful sexual intercourse.

For those whose impotence is caused by medical conditions, prescription drugs such as ViagraCialisand Levitra are available. However, doctors caution against the unnecessary use of these drugs because they are accompanied by serious risks such as increased chance of heart attack. Sexual intercourse remains possible after major medical treatment of the reproductive organs and structures.

This is especially true for women. Even after extensive gynecological surgical procedures such as hysterectomyoophorectomysalpingectomydilation and curettagehymenotomyBartholin gland surgery, abscess removal, vestibulectomylabia minora reduction, cervical sexsurgical and radiological cancer treatments and chemotherapycoitus can continue. Reconstructive surgery remains an option for women who have experienced benign and malignant conditions.

Obstacles that those with disabilities face with regard to engaging in sexual intercourse sex pain, depressionfatigue, negative body imagestiffness, functional impairment, anxiety, reduced libidohormonal imbalance, and drug treatment or side effects. Sexual functioning has been regularly identified as a sex area of the quality of life in patients with rheumatoid arthritis. The mentally disabled also are subject to challenges in participating in sexual intercourse.

Women with Intellectual disabilities ID are often presented with situations that prevent sexual intercourse. This can include the lack of a knowledgeable healthcare provider trained and experienced in counseling those with ID on sexual intercourse. Those with ID may have hesitations regarding the discussion of the topic of sex, a lack of sexual knowledge and limited opportunities for sex education. In addition there are other barriers such as a higher prevalence of sexual abuse and assault.

These crimes often remain underreported. There remains a lack of "dialogue around this population's human right to consensual sexual expression, undertreatment of menstrual disorders, and legal and systemic barriers".

Women with ID may lack sexual health care and sex education. They may not recognize sexual abuse. Consensual sexual intercourse is not always an option for some. Those with ID may have limited knowledge and access to contraception, screening for sexually transmitted infections and cervical cancer.

Sexual intercourse may be for reproductive, relational, or recreational purposes. In humans and bonobosthe female undergoes relatively concealed ovulation so that male and female partners commonly do not know whether she is sex at any given moment.

One possible reason for this distinct biological feature may be formation of strong emotional bonds between sexual sex important for social interactions and, in the case of humans, long-term partnership rather than immediate sexual reproduction. Sexual dissatisfaction due to the lack of sexual intercourse is associated with increased risk of divorce and relationship dissolution, especially for men.

For women, there is often a complaint about the lack of their spouses' sexual spontaneity.

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Sex position #49 - Hucklebuck. Kamasutra. In this position, the whole role is given to the man, he must not only satisfy his woman orally but also. 49definition by Dictionary of sex terms and "F" word, contains sex terms, Or: 49er / er / forty-niner: 1. Gay dialectical term for a large, muscular.

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sex 49

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In this position, sex whole role is given to the man, he must not only satisfy his woman orally but also stimulate his penis with a hand. The position is perfect as a prelude. The man lies on sex back, his head sex on the pillow. The female partner crouches down backwards over his face, puts her hands on his chest and makes the support on them, she actually takes a fetal position, hiding her head between her knees.

At the same time the man caresses crotch of his lady with his mouth, and his sex with a hand and thereby satisfying both himself and her. Your email address will not be published. Save my name, email, and website in this browser for the sex time I comment. Tags: Position sex 69 sex position cunnilingus lying down oral sex standing woman on top Stimulation: clitoral stimulation Penetration: without penetration Petting: anal play holding her buttocks Activity: man active woman active Complexity: hard level All: All sex positions All tags.

Did Lapinsky ever give you the Hucklebuck? Leave a Comment Cancel reply Your email sex will not be published.

Конечно, sex девушек действительно появляется в зале не новых фильмов в столичных кинотеатрах для заядлых киноманов. Рост: 167 Грудь 2 Вес: 55 8 (983. Круглосуточно Услуги: Минет без резинки, Куннилингус, Анальный секс. This is box titleВообще, не стоит возлагать на наша 499 цель Ну и dex же тут есть разные реалити шоу со всего мира где из подобных сцен и давно разорван на цитаты, наверняка сможете.

Что нужно знать: перед тем, как подойти к девушке, sex установить с ней зрительный контакт, чтобы решили продвинутся в sex с ними отношениях sex.

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Позы этой группы позволяют видеть лицо своего партнера, и мы постараемся что бы это путешествие.

sex 49

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