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Skip to search form Skip to main content. The Evolutionary Origin of Female Orgasm. Wagner Published in Journal of experimental zoology.

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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 Sallybut 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.

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We thought we were the only species to enjoy intimate interactions, but as Jason G Goldman discovers, a few curious couplings in nature have changed our view. Sex, we are told, is pleasurable. That's because most scientific accounts of sexual behaviour rest upon evolutionary explanations rather than the more immediately relevant mental and emotional experiences.

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By Mary Roach. She evaluated ten theories purporting to explain the evolutionary function of female orgasm, and found all of them lacking. Male and female embryos start out with the same equipment, and then part ways. Men are left with nonfunctioning breasts; women are left with nonfunctioning penises.

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The menstrual cycle is the regular natural change that occurs in the female reproductive system specifically the uterus and ovaries that makes pregnancy possible. The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women and 21 to 35 days in adults an average of 28 days [3] [7] [8].

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Skip to search form Skip to main content. The Evolutionary Origin of Female Orgasm. Wagner Published in Journal of experimental zoology.

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Evolutionary explanations for sexual behavior and orgasm most often posit facilitating reproduction as the primary function i. Other reproductive benefits of sexual pleasure and orgasm such as improved bonding of parents have also been discussed but not thoroughly. Although sex is known to be highly reinforcing, behaviorist principles are rarely invoked alongside evolutionary psychology in order to account for human sexual and social behavior. In this paper, I will argue that intense sexual pleasure, especially orgasm, can be understood as a primary reinforcer shaped by evolution to reinforce behavior that facilitates reproductive success i.

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Human female orgasm is a vexed question in the field while there is credible evidence of cryptic female choice that has many hallmarks of orgasm in other species. Our initial goal was to produce a proof of concept for allowing females to study an aspect of infertility in a home setting, specifically by aligning the study of human infertility and increased fertility with the study of other mammalian fertility. In the latter case - the realm of oxytocin-mediated sperm retention mechanisms seems to be at work in terms of ultimate function differential sperm retention while the proximate function rapid transport or cervical tenting remains unresolved.

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The menstrual cycle begins with the maturation of oocytes through the process of oogenesis, as well as concurrent follicle development that stimulates ovulation. Oogenesis starts with the process of developing oogonia via the transformation of primordial follicles into primary oocytes, a process called oocytogenesis. Oocytogenesis is complete either before or shortly after birth in humans. During the menstrual cycle primary oocytes complete maturation through further meiotic divisions.

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