Mechanics of human sexuality explained

The mechanics of human sexuality or mechanics of sex, or more formally the biomechanics of human sexuality, is the study of the mechanics related to human sexual activity. Examples of topics include the biomechanical study of the strength of vaginal tissues^[1] and the biomechanics of male erectile function.^[2] The mechanics of sex under limit circumstances, such as sexual activity at zero-gravity in outer space, are also being studied.^[3]

Pioneering researchers studied the male and female genitals during coitus (penile-vaginal penetration) with ultrasound technology in 1992^[4] and magnetic resonance imaging (MRI) in 1999, mapping the anatomy of the activity and taking images illustrating the fit of male and female genitals. In the research using MRI, researchers imaged couples performing coitus inside an MRI machine.^[5] 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 the penis, and that the vaginal walls wrap snugly around it.^{[5] [6]} Moreover, MRI during coitus indicate that the internal part of the clitoris^{[7] [8]} is stimulated by penile-vaginal movements.^{[9] [4]} These studies highlight the role of the clitoris and indicate that what is termed the G-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.^[10]

Further reading

• Bondil . P . Costa . P . Daures . JP . Louis . JF . Navratil . H . Clinical study of the longitudinal deformation of the flaccid penis and of its variations with aging . European Urology . 21 . 4 . 284–6 . 1992 . 10.1159/000474858 . 1459150.
• Traxer . Olivier . Haab . François . Anidjar . Maurice . Gattegno . Bernard . Cussenot . Olivier . Thibault . Philippe . Comparaison des propriétés biomécaniques de l'ancrage vaginal dans les suspensions du col vésical selon la technique de Burch et une technique percutanée . Comparison of biomechanical properties of the vaginal fixation in bladder neck suspensions according to the Burch technique and a percutaneous technique . Progrès en Urologie . 9 . 4 . 727–30 . 1999 . 10555228 . fr . 2010-10-05 . https://web.archive.org/web/20130603060708/http://www.urofrance.org/fileadmin/documents/data/PU/1999/PU-1999-00090727/TEXF-PU-1999-00090727.PDF . 2013-06-03 . dead .

Notes and References

1. 10.1016/S0301-2115(03)00333-6 . Cosson . Michel . Lambaudie . Eric . Boukerrou . Malik . Lobry . Pierre . Crépin . Gilles . Ego . Anne . A biomechanical study of the strength of vaginal tissues. Results on 16 post-menopausal patients presenting with genital prolapse . European Journal of Obstetrics, Gynecology, and Reproductive Biology . 112 . 2 . 201–5 . 2004 . 14746960.
2. Udelson . Daniel . Biomechanics of male erectile function . . 4 . 1031–48 . 2007 . 10.1098/rsif.2007.0221 . 17. 2396202 . 17478408.
3. News: Alan . Boyle . Alan Boyle . July 24, 2006 . Outer-space sex carries complications . NBC News.
4. Buisson . O. . Foldes . P. . Jannini . E. . Emmanuele A. Jannini . Mimoun . S. . 2010 . Coitus as revealed by ultrasound in one volunteer couple . J. Sex. Med. . 7 . 8. 2750–2754 . 10.1111/j.1743-6109.2010.01892.x. 20626602 .
5. Schultz . Willibrord Weijmar . van Andel . Pek . Sabelis . Ida . Mooyaart . Eduard . Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal . . 319 . 7225 . 1596–600 . 1999 . 10600954 . 28302 . 10.1136/bmj.319.7225.1596.
6. News: Thomas . Stuttaford . Thomas Stuttaford . Suzi . Godson . October 6, 2007 . Taking the first steps . The Times.
7. O'Connell . H.E. . Hutson . J.M. . Anderson . C.R. . Plenter . R.J. . 1998 . Anatomical relationship between urethra and clitoris . The Journal of Urology . 159 . 6. 1892–1897 . 10.1016/s0022-5347(01)63188-4 . 9598482.
8. O'Connell . H.E. . DeLancey . J.O. . 2005 . Clitoral anatomy in nulliparous, healthy, premenopausal volunteers using unenhanced magnetic resonance imaging . The Journal of Urology . 173 . 6. 2060–2063 . 10.1097/01.ju.0000158446.21396.c0. 1283096 . 15879834.
9. Foldes . P. . Buisson . O. . 2009 . The clitoral complex: a dynamic sonographic study . J. Sex. Med. . 6 . 5. 1223–1231 . 10.1111/j.1743-6109.2009.01231.x . 19453931. 5096396 .
10. Buisson . O. . Jannini . E.A. . 2013 . Pilot echographic study of the differences in clitoral involvement following clitoral or vaginal sexual stimulation . J. Sex. Med. . 10 . 11. 2734–2740 . 10.1111/jsm.12279. 23937167 .