BMJ 1999;319:1596-1600 ( 18 December )

Papers

Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal

Willibrord Weijmar Schultz, associate professor of gynaecology, ^a Pek van Andel, physiologist, ^b Ida Sabelis, anthropologist, ^d Eduard Mooyaart, radiologist. ^c

^a Department of Gynaecology, University Hospital Groningen, PO Box 30 001, 9700 RB Groningen, Netherlands, ^b Laboratory for Cell Biology and Electron Microscopy, University Hospital Groningen, ^c Department of Radiology, University Hospital Groningen, ^d Department of Business Anthropology VU, De Boelen 1081C-NL, 1081 HV, Amsterdam

Correspondence to: W Weijmar Schultz w.c.m.weymar.schultz{at}oprit.rug.nl

Objective: To find out whether taking images of the male and female genitals during coitus is feasible and to find out whether former and current ideas about the anatomy during sexual intercourse and during female sexual arousal are based on assumptions or on facts.
Design: Observational study.
Setting: University hospital in the Netherlands.
Methods: Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus. Thirteen experiments were performed with eight couples and three single women.
Results: The images obtained showed that during intercourse in the "missionary position" the penis has the shape of a boomerang and 1/3 of its length consists of the root of the penis. During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened. The size of the uterus did not increase during sexual arousal.
Conclusion: Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.

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