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Themechanics of human sexuality ormechanics of sex, or more formally thebiomechanics ofhuman sexuality, is the study of the mechanics related tohuman sexual activity. Examples of topics include the biomechanical study of the strength ofvaginal tissues[1] and the biomechanics ofmale erectile function.[2][3] The mechanics of sex under limit circumstances, such assexual activity at zero-gravity in outer space, are also being studied.[4]
Pioneering researchers studied the male and female genitals duringcoitus (penile-vaginal penetration) withultrasound technology in 1992[5] andmagnetic resonance imaging (MRI) in 1999, mapping theanatomy of the activity and taking images illustrating the fit of male and female genitals.[6] In the research using MRI, researchers imaged couples performing coitus inside an MRI machine.[6] The magnetic resonance images also showed that the penis has the shape of a boomerang, that one third of its length consists of the root of thepenis, and that the vaginal walls wrap snugly around it.[6][7] Moreover, MRI during coitus indicate that the internal part of theclitoris[8][9] is stimulated by penile-vaginal movements.[10][5] These studies highlight the role of the clitoris and indicate that what is termed theG-spot may only exist because the highly innervated clitoris is pulled closely to the anterior wall of the vagina when the woman is sexually aroused and during vaginal penetration.[11]
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