After written informed consent had been obtained, the participants were invited to come for a scan when the equipment was available on a Saturday. Participants were assured confidentiality, privacy, anonymity, and the possibility of withdrawing from the study at any time. The experimental procedure was explained in a letter sent to respondents along with an informed consent form. The participants (pairs of men and women) were recruited by personal invitation and through a local scientific television programme Respondents were invited to participate if they met the following criteria: older than 18 years, intact uterus and ovaries, and a small to average weight/height index. The aim of the study was initially to find out whether taking images of the male and female genitals during coitus is feasible, and later whether former and current ideas about the anatomy during sexual intercourse and during female sexual arousal are based on assumptions or on facts.
Magnetic resonance imaging had already been used as a diagnostic tool to study erectile impotence 7 it is particularly attractive for this kind of study because it produces images with exquisite anatomical detail that are clearer than those obtained with ultrasonography or radiography, and-as far as we know-it is safe.
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Our search started in 1991 when one of us (PvA) saw a black and white slide of a midsagittal magnetic resonance image of the mouth and throat of a professional singer who was singing “aaa.” He remembered Leonardo's drawing and wondered whether it would be possible to take such an image of human coitus We decided to try, as an ad hoc “instrument-oriented” study, despite the unscientific and other irrelevant reactions we expected and received: honi soit, qui mal y pense. We used magnetic resonance imaging to study the anatomy and physiology of human sexual intercourse. 6 The images were of relatively poor quality as they used hand held, self scanning equipment, and none of the images was overview. In 1992 Riley et al published an ultrasound study on copulation. Masters and Johnson presumed that the greater volume of the uterus was due to engorgement with blood However, they qualified their presumption: “In view of the artificial nature of the equipment, legitimate issue may be raised with the integrity of observed reaction patterns.” 4 This increase disappeared 10-20 minutes after orgasm When sexual excitement without orgasm occurred, the volume returned to normal in 30-60 minutes. 4 5 Their most remarkable observations regarding sexual arousal in the woman were the backwards and upwards movements of the anterior vaginal wall (vaginal tenting) and a 50-100% greater volume of the uterus. In the 1960s Masters and Johnson made their assessments with an artificial penis that could mechanically imitate natural coitus and by “direct observation”-the introduction of a speculum and bimanual palpation. The size of the uterus did not increase during sexual arousal.Ĭonclusion: Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy. During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened. 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. Thirteen experiments were performed with eight couples and three single women. Methods: Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus.
Setting: University hospital in the Netherlands. 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.