In men and women sexual arousal culminates in orgasm, with female orgasm solely from sexual intercourse often regarded as a unique feature of human sexuality.
However, orgasm from sexual intercourse occurs more reliably in men than in women likely reflecting the different types of physical stimulation men and women require for orgasm.
In men, orgasms are under strong selective pressure as orgasms are coupled with ejaculation and thus contribute to male reproductive success.
By contrast, women's orgasms in intercourse are highly variable and are under little selective pressure as they are not a reproductive necessity. The proximal mechanisms producing variability in women's orgasms are little understood.
In Marie Bonaparte The female orgasm revealed torrent that a shorter distance between a woman's clitoris and her urethral meatus CUMD increased her likelihood of experiencing orgasm in intercourse. She based this on her published data which were never statistically analyzed. In Landis and colleagues published similar data suggesting the same relationship, but these data too were never fully analyzed.
We analyzed raw data from these two studies and found that both demonstrate a strong inverse relationship between CUMD and orgasm during intercourse. Unresolved is whether this increased likelihood of orgasm with shorter CUMD reflects increased penile-clitoral contact during sexual intercourse or increased penile stimulation of internal aspects of the clitoris.
CUMD likely reflects prenatal androgen exposure, with higher androgen levels producing larger distances. Thus these results suggest that women exposed to lower levels of prenatal androgens are more likely to experience orgasm during sexual intercourse. This gender disparity in the reliability of reaching orgasm during sexual intercourse has been thought to reflect evolutionary Lloyd, or social Hite, processes.
An anatomical explanation for this The female orgasm revealed torrent has also been proposed such that variation The female orgasm revealed torrent the distance between a woman's clitoral glans and her vagina predicts the likelihood that she will experience orgasm in intercourse Narjani, Specifically it was proposed that if this distance is less than 2. This relationship has not been statistically evaluated, but two historical studies provide data supporting such a relationship Narjani, ; Landis, Landis, and Bowles, We use an unconventional approach to investigate the proposed relationship between variation in women's genitals and orgasm during intercourse.
We first explore the history of this idea in the scientific and popular literature and then present statistical analysis of the two available historical datasets with data relevant The female orgasm revealed torrent the proposed relationship Narjani, ; Landis, Landis, and Bowles, While there are challenges to the validity of these data, we find them sufficiently supportive of a relationship between women's genital anatomy and the occurrence of orgasm in intercourse to feel that they can serve as the basis for developing modern well-controlled studies of the relationship between women's genital anatomy and the occurrence of orgasm in intercourse.
Orgasm is the culmination of sexual arousal, and the promise of orgasm may provide primary motivation for individuals to engage in sexual intercourse. However, sexual arousal itself is rewarding and likely common to the sexuality of all mammals.
Studies of animals have shown that sexual arousal is rewarding even when sexual intercourse doesn't occur Meisel, Camp and Robinson, Certainly humans, at least men, sometimes seek out The female orgasm revealed torrent, such as strip clubs, where sexual arousal without orgasm is the primary goal and where sexual intercourse is unlikely to occur.
In male mammals, sufficient sexual arousal leads to ejaculation and orgasm. Thus it is possible that orgasm occurs in all male mammals. The case in females is less clear. While there is evidence that female sexual arousal is rewarding Meisel, Camp and Robinson,it is unclear whether humans, or possibly primates, Goldfoot, et al. Even in primates female orgasm is not universal, with little evidence of its occurrence outside of humans. To further complicate matters, there remains a lack of complete agreement on what constitutes female orgasm Meston, et al.
Although sexual arousal precedes orgasm in women, the specific sexual stimulation that triggers orgasm varies greatly among women. Women reach orgasm from direct clitoral stimulation, indirect clitoral stimulation, vaginal stimulation or stimulation of internal areas surrounding the vagina.
Some women experience orgasm solely from sexual intercourse, whereas other women require concurrent stimulation of the external parts of the clitoris in order to reach orgasm during sexual intercourse, and some women never experience orgasm in intercourse under any conditions.
A period of increasing sexual arousal precedes orgasm, typically from genital stimulation, in those women who experience orgasm. Given the differences in male and female genitals it is likely that the nature and extent of genital stimulation necessary for orgasm differs between men and women. This appears to certainly be the case for orgasms which occur solely from sexual intercourse. A striking sex difference in the onset of the occurrence of orgasm has been known for more than 50 years The female orgasm revealed torrent 1.
Post-pubertal males routinely, and apparently easily, experience orgasm, as indicated by their reliable ejaculatory reflex, but female orgasm appears to develop more slowly and is less predictable than male orgasm.
While there are women who reach orgasm The female orgasm revealed torrent easily and routinely as do men, and some women who experience orgasm more easily and multiple times during a single session of sexual intercourse, this is not women's typical experience with orgasm.
This sex difference in the onset of orgasm is illustrated by when the maximum number of men or women have experienced orgasm. Figure 1 illustrates the cumulative incidence, across time, of males ejaculating Kinsey, Pomeroy and Martin, in comparison to the cumulative occurrence of orgasm in women Kinsey, Pomeroy, Martin, and Gebhard, Taken together these data suggest that orgasm is a different phenomenon in women than in men, The female orgasm revealed torrent under different developmental influences and likely reflecting genital differences between men and women.
Illustrates the sex difference in the occurrence of orgasm in males and females in relation to age. Males show a rapid transition from few boys experiencing orgasm prior to puberty to all men experiencing orgasm soon after puberty. Women, by contrast show a much more gradual developmental curve.
Male data are adapted from Kinsey, Pomeroy, and Martin, and the female data are adapted from Kinsey, et al. Lloyd argued that this sex difference in the distribution of orgasm supports strong evolutionary selective pressure on orgasm during intercourse in men, but not women. The direct connection between male ejaculation during intercourse and reproductive success makes understandable the almost certainty of The female orgasm revealed torrent orgasm during intercourse.
However, the source of the striking variability in the occurrence of orgasm in intercourse among women is unknown, though a number of theories have been proposed concerning its origin.
Freud posited that women's capacity to experience orgasm during intercourse varied according to their psychoanalytic development.
In his view, girls initially experienced clitoral eroticism analogous to boy's penile eroticism. As girls matured psychologically they transitioned from clitoral eroticism to vaginal eroticism, which allowed them to experience orgasm during vaginal intercourse Freud, In Freud's view, orgasm from vaginal intercourse reflected mature, psychologically healthy, sexuality whereas continued reliance on clitoral arousal for orgasm reflected psychologically immature development. The names don't actually indicate different types of orgasms, but indicates the type of genital stimulation triggering the orgasm.
Since a majority of women do not routinely and reliably experience orgasm solely from sexual intercourse Lloyd,Freud's psychoanalytic arguments have resulted in The female orgasm revealed torrent of sexual inadequacy for those many women whose orgasms do not result from vaginal stimulation.
This view, that there is a mature and psychologically healthy form of female orgasm, has become less prevalent, but is still promoted more than years after Freud's proposals.
For example, there are those who argue that women experiencing orgasms in intercourse have better mental health than women who reach orgasms through other means Brody and Costa, Similarly, there are self-help programs whose goal is for women to achieve orgasm solely from vaginal intercourse Kline-Graber and Graber, Thus orgasm solely from sexual intercourse continues to occupy a significant place in women's sexuality. Given that a majority of women do not routinely experience orgasm from such stimulation Lloyd,it seems incomprehensible The female orgasm revealed torrent this reflects that a majority of women are psychologically immature.
Instead this demonstrates the variability in women's orgasms and that orgasm solely from sexual intercourse is not routine for most women. The question remains unanswered as to why a minority of women routinely experience orgasm solely from sexual intercourse, whereas most women require other types of stimulation.
Women differ markedly in the type of genital stimulation that reliably induces orgasm. On the one hand are women who reliably trigger orgasm through vaginal or cervical stimulation without any direct contact with the clitoral glans or The female orgasm revealed torrent Alzate, ; Komisaruk, et al.
On the other hand are women who reliably reach orgasm during intercourse only when there is concurrent direct clitoral stimulation Masters and Johnson, ; Fisher, ; Hite, Thus there is a long history of the notion that clitoral stimulation, direct or indirect, is required for women to experience orgasm in intercourse. Unfortunately, survey data on the occurrence of orgasm in intercourse do not typically distinguish intercourse without concurrent clitoral stimulation from intercourse with concurrent clitoral stimulation see Lloyd, for a more complete discussion of this issue.
Thus current estimates provide imprecise information on the proportion of women who routinely experience orgasm solely from vaginal intercourse without concurrent direct clitoral stimulation.
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Still, whether or not concurrent clitoral stimulation is specified, only a minority of women report reliably experiencing orgasm from vaginal intercourse. It seems unlikely that most women in these studies have concurrent clitoral stimulation during intercourse because such stimulation is almost uniformly successful in inducing orgasm Fisher, ; Hite and thus the percentages of women experiencing orgasm in intercourse would be correspondingly higher. It seems clear, however, that some of the variability in female orgasm during intercourse stems from whether or not intercourse itself produces clitoral stimulation.
Clitoral stimulation during sexual intercourse might reflect how closely the clitoral glans and shaft are positioned relative to the vaginal opening, affecting the likelihood that the male's penis would stimulate the clitoris during vaginal thrusting.
This distance varies markedly among women, ranging from 1. However the relationship between variation in this distance and variation The female orgasm revealed torrent the occurrence of orgasm during intercourse is not fully known.
The notion that women's orgasm during intercourse is related to the location of the clitoral glans in relation to a woman's vagina was suggested more than 85 years ago Narjani,Dickinson,Landis, Landis, and Bowles, Marie The female orgasm revealed torrent, using the pseudonym Narjani, published the first data relating clitoral glans position to the occurrence of women's orgasm during sexual intercourse Narjani, Bonaparte measured the distance between the underside of the clitoral glans and the centre of the urinary meatus CUMD 2 and compared that distance to the likelihood that the woman experienced orgasm during sexual intercourse.