Sexual human orgasm

Billy Crystal may have been shocked when Meg Ryan so effectively—and amusingly—faked an orgasm in a restaurant during the movie When Harry Met Sally , but surveys suggest only one-third of women are regularly fully aroused during intercourse. And although poor partner performance, psychological issues, or physiological shortfalls are often cited as the reason, two evolutionary biologists now offer a provocative new explanation. In a paper published today, they argue that female orgasm is an evolutionary holdover from an ancient system, seen in some other mammals, in which intercourse stimulated important hormonal surges that drive ovulation. And because those hormonal surges no longer confer a biological advantage, orgasms during intercourse may be lost in some women.
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Where does the female orgasm come from? Scientists think they know

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Orgasm | physiology | Britannica

But when? And how? Since Aristotle, researchers have looked for the biological and functional purposes of the female orgasm. Men need to have an orgasm to release sperm, but women do not need to orgasm to ovulate or become pregnant. Some researchers have suggested that orgasms persist because they have a psychological function in reproduction — they feel good, so they encourage women to have more sex.
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Female Sexual Arousal: Genital Anatomy and Orgasm in Intercourse

Orgasm is marked by a feeling of sudden and intense pleasure, an abrupt increase in pulse rate and blood pressure , and spasms of the pelvic muscles that cause contractions of the lower vagina in the female and contractions of the urethra and ejaculation by the male. Males and females are physiologically capable of experiencing orgasm from infancy, and children who engage in masturbation or sex play may achieve this sensation. Orgasm can occur while a person is asleep and dreaming, as well as from sexual intercourse or masturbation. Since the male responses are usually more rapidly induced, the male probably achieves orgasms more consistently during intercourse than does the female. Once the female attains an orgasm, however, she remains sexually excited longer and may experience several successive orgasms, whereas the male is ordinarily unable to experience a second orgasm except after a waiting period.
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Orgasm is one of the most intense pleasures attainable to an organism, yet its underlying mechanisms remain poorly understood. On the basis of existing literatures, this article introduces a novel mechanistic model of sexual stimulation and orgasm. In doing so, it characterizes the neurophenomenology of sexual trance and climax, describes parallels in dynamics between orgasms and seizures, speculates on possible evolutionary origins of sex differences in orgasmic responding, and proposes avenues for future experimentation. Here, a model is introduced wherein sexual stimulation induces entrainment of coupling mechanical and neuronal oscillatory systems, thus creating synchronized functional networks within which multiple positive feedback processes intersect synergistically to contribute to sexual experience. These processes generate states of deepening sensory absorption and trance, potentially culminating in climax if critical thresholds are surpassed.
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Comments
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