Mechanics of human sexuality

Short description: Biomechanics of human sexual intercourse

Template:Sex (biology) sidebar 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][3] The mechanics of sex under limit circumstances, such as sexual activity at zero-gravity in outer space, are also being studied.[4]

Pioneering researchers studied the male and female genitals during coitus (penile-vaginal penetration) with ultrasound technology in 1992[5] and magnetic resonance imaging (MRI) in 1999, mapping the anatomy 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 the penis, and that the vaginal walls wrap snugly around it.[6][7] Moreover, MRI during coitus indicate that the internal part of the clitoris[8][9] is stimulated by penile-vaginal movements.[10][5] 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.[11]

## References

1. ↑ Cosson, Michel; Lambaudie, Eric; Boukerrou, Malik; Lobry, Pierre; Crépin, Gilles; Ego, Anne (2004). "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. doi:10.1016/S0301-2115(03)00333-6. PMID 14746960.
2. ↑ Udelson, Daniel (2007). "Biomechanics of male erectile function". Journal of the Royal Society Interface 4 (17): 1031–48. doi:10.1098/rsif.2007.0221. PMID 17478408.
3. ↑ Mohamed, Ahmed M.; Erdman, Arthur G.; Timm, Gerald W. (2010). "The Biomechanics of Erections: Two- Versus One-Compartment Pressurized Vessel Modeling of the Penis". Journal of Biomechanical Engineering 132 (12). doi:10.1115/1.4002794. PMID 21142318.
4. ↑ Boyle, Alan (July 24, 2006). "Outer-space sex carries complications". NBC News. https://www.nbcnews.com/id/wbna14002908.
5. ↑ 5.0 5.1 Buisson, O.; Foldes, P.; Jannini, E.; Mimoun, S. (2010). "Coitus as revealed by ultrasound in one volunteer couple". J. Sex. Med. 7 (8): 2750–2754. doi:10.1111/j.1743-6109.2010.01892.x. PMID 20626602.
6. ↑ 6.0 6.1 6.2 Schultz, Willibrord Weijmar; van Andel, Pek; Sabelis, Ida; Mooyaart, Eduard (1999). "Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal". BMJ 319 (7225): 1596–600. doi:10.1136/bmj.319.7225.1596. PMID 10600954.
7. ↑ Stuttaford, Thomas; Godson, Suzi (October 6, 2007). "Taking the first steps". The Times. http://www.timesonline.co.uk/tol/life_and_style/health/expert_advice/article2595671.ece.
8. ↑ 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. doi:10.1016/s0022-5347(01)63188-4. PMID 9598482.
9. ↑ 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. doi:10.1097/01.ju.0000158446.21396.c0. PMID 15879834.
10. ↑ Foldes, P.; Buisson, O. (2009). "The clitoral complex: a dynamic sonographic study". J. Sex. Med. 6 (5): 1223–1231. doi:10.1111/j.1743-6109.2009.01231.x. PMID 19453931.
11. ↑ 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. doi:10.1111/jsm.12279. PMID 23937167.

## Further reading

* Bondil, P; Costa, P; Daures, JP; Louis, JF; Navratil, H (1992). "Clinical study of the longitudinal deformation of the flaccid penis and of its variations with aging". European Urology 21 (4): 284–6. doi:10.1159/000474858. PMID 1459150.
* Traxer, Olivier; Haab, François; Anidjar, Maurice; Gattegno, Bernard; Cussenot, Olivier; Thibault, Philippe (1999). "Comparaison des propriétés biomécaniques de l'ancrage vaginal dans les suspensions du col vésical selon la technique de Burch et une technique percutanée" (in fr). Progrès en Urologie 9 (4): 727–30. PMID 10555228. http://www.urofrance.org/fileadmin/documents/data/PU/1999/PU-1999-00090727/TEXF-PU-1999-00090727.PDF. Retrieved 2010-10-05.

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Outline of human sexuality

Physiology and biology|

* Erection
* Insemination
* Intersex
* Libido
* Nocturnal emission
* Orgasm
* Female and male ejaculation
* Pelvic thrust
* Pre-ejaculate
* Pregnancy
* Sexual arousal
* Sexual stimulation

Health and
education|

* Birth control
* Condom
* Masters and Johnson
* Reproductive medicine
* Andrology
* Gynaecology
* Urology
* Safe sex
* Sex education
* Sex therapy (PLISSIT model)
* Sexology
* Sexual dysfunction
* Erectile dysfunction
* Hypersexuality
* Hyposexuality
* Sexual medicine
* Sexual surrogate
* Sexually transmitted infection

Identity and diversity|

* Gender binary
* Gender identity
* Men who have sex with men
* Sexual identity
* Sexual orientation
* Women who have sex with women

Law|

* Age of consent
* Criminal transmission of HIV
* Child sexual abuse
* Incest
* Indecent exposure
* Obscenity
* Sexual abuse
* Cybersex trafficking
* Rape
* Sex trafficking
* Sexual assault
* Sexual harassment
* Sexual misconduct
* Sexual slavery
* Sexual violence

History|

* Blue Movie
* Counterculture of the 1960s
* Feminist sex wars
* Golden Age of Porn
* History of erotic depictions
* Sexual revolution

Relationships
and society|

* Anarchism and love/sex
* Extramarital sex
* Family planning
* Flirting
* Free love
* Marriage
* Modesty
* Polyamory
* Premarital sex
* Promiscuity
* Romance
* Sex-positive movement
* Sexual abstinence
* Sexual addiction
* Sexual attraction
* Sexual capital
* Sexual ethics
* Sexual objectification
* Sexual slang

By country|

* Ancient Rome
* China
* India
* Japan
* Philippines
* South Korea
* United States

Sexual activities|

* Conventional sex
* Anal sex
* Bareback
* BDSM
* Child sex
* Creampie
* Edging
* Erotic sexual denial
* Fetishism
* Fingering
* Fisting
* Gang bang
* Group sex
* Masturbation
* Mechanics of sex
* Nipple stimulation
* Non-penetrative sex
* Facial
* Foot fetishism
* Footjob
* Forced orgasm
* Frot
* Handjob
* Mammary intercourse
* Sumata
* Oral sex
* 69
* Anilingus
* Cunnilingus
* Fellatio
* Irrumatio
* Paraphilia
* Pompoir
* Quickie
* Sex in space
* Sex positions
* Sexual fantasy
* Sexual fetishism
* Sexual intercourse
* Foreplay
* Sexual penetration
* Swinging
* Tribadism
* Urethral intercourse
* Urolagnia
* Virtual sex
* Cybersex
* Erotic talk
* Wet T-shirt contest

Sex industry|

* Red-light district
* Adult video games
* Erotica
* Pornography
* Film actor
* Prostitution
* Survival sex
* Sex museum
* Sex shop
* Sex tourism
* Child
* Female
* Sex worker
* Sex toy
* doll
* Strip club
* Webcam model

Religion and
sexuality|

* Buddhism
* Christian demonology
* Daoism
* Islam
* Mormonism
* Sex magic

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Human sexuality and sexology

Sexual relationship
phenomena

* Asexuality
* Gray asexuality
* Bisexuality
* Casual relationship
* Casual sex
* Celibacy
* Celibacy syndrome
* Herbivore men
* Committed relationship
* Conventional sex
* Free love
* Foreplay
* Heterosexuality
* Homosexuality
* Hypersexuality
* Marriage
* One-night stand
* Polyamory
* Promiscuity
* Female
* Romantic love
* Romantic orientation
* Flirting
* Sex life
* Sexual abstinence
* Sexual orientation
* Sexual partner
* Single person
* Swinging

Sexual dynamics|

* Hypergamy
* Intersex
* Physical attractiveness
* Sexual attraction
* Sexual capital
* Sexual ethics
* Sexual frustration

See also|

* Sexual addiction
* Sex Addicts Anonymous
* Sexual surrogate

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Human physiology of sexual reproduction

Menstrual cycle|

* Menarche
* Menstruation
* Follicular phase
* Ovulation
* Luteal phase

Gametogenesis|

* Spermatogenesis
* spermatogonium
* spermatocyte
* spermatid
* sperm)
* Oogenesis (oogonium
* oocyte
* ootid
* ovum)
* Germ cell
* gonocyte
* gamete)

Human sexual activity|

* Sexual arousal
* Sexual intercourse
* Masturbation
* Erection
* Orgasm
* Ejaculation
* Insemination
* Fertilization / Fertility
* Implantation
* Pregnancy
* Postpartum period
* Mechanics of sex

Development of the reproductive system|

* Sexual differentiation
* Sexual dimorphism
* Feminization
* Virilization)
* Puberty
* Gonadarche
* Tanner scale
* Pubarche
* Menarche
* Spermarche
* Adrenarche)
* Maternal age / Paternal age
* Menopause

Egg|

* Ovum
* Oviposition
* Oviparity
* Ovoviviparity
* Vivipary

Reproductive endocrinology
and infertility|

* Hypothalamic–pituitary–gonadal axis
* Hypothalamic–pituitary–prolactin axis
* Andrology
* Hormone

Breast|

* Thelarche
* Development
* Lactation
* Breastfeeding

Human reproductive system|

* Male
* Female

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