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Contributors: WWS initiated and coordinated the formulation of the study hypothesis, designed the protocol, and participated in data collection, interpretation of the findings, and writing of the paper; he is guarantor of the study. PvA had the original idea for the present study, and participated in formulation of the study hypothesis, data collection, interpretation of the findings, and writing of the paper. IS, together with her partner, participated in the first two experiments and helped design the protocol. EM participated in the execution of the study, particularly data collection and interpretation of the magnetic resonance findings. 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. Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus.

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Cock in pussy mri

It took years, a lobby, undesired publicity, and a godsend two tablets of sildenafil 25 mg to obtain our images. They show that such pictures are feasible and add to our knowledge of anatomy. We did not foresee that the men would have more problems with sexual performance maintaining their erection than the women in the scanner.

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All the women had a complete sexual response, but they described their orgasm as superficial. Only the first couple was able to perform coitus adequately without sildenafil experiments 1 and 2. The reason might be that they were the only participants in the real sense: involved in the research right from the beginning because of their scientific curiosity, knowledge of the body, and artistic commitment.

And as amateur street acrobats they are trained and used to performing under stress. The hypothesised anatomy of human coitus, as drawn by Leonardo da Vinci in about and by Dickinson incould be tested with magnetic resonance imaging. It has the shape of a boomerang and not of an S as envisaged by Dickinson. Leonardo and Dickinson clearly underestimated the size of the root of the penis.

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Scanning of the position of the human genitals during coitus gives a convincing impression of the enormous size of the average penis in erection root plus pendulous part is 22 cm and of the volume of vaginal and pelvic space required by the pendulous part of the penis.

Recent research on the anatomical relation between urethra and clitoris showed that the perineal urethra is embedded in the anterior vaginal wall and is surrounded by erectile tissue in all directions except posteriorly where it relates to the vaginal wall.

Details of the vaginal wall, the urethra, and the bulbs of the vestibule were unfortunately beyond the resolution of our current equipment.

However, we were able to see displacement of the uterus upwards and lengthening of the anterior vaginal wall and hardly any change in the position of the uterus during sexual arousal, unless it was caused by intromission of the penis. In contrast to the findings of Masters and Johnson, 4 our images did not show an increase in the size of the uterus during sexual arousal.

These observations are not surprising. Masters and Johnson made their observations with bimanual palpation.

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Their interpretation may have been caused by the raising of the uterus or filling of the bladder during their experiments. Magnetic resonance imaging showed strikingly that during female sexual arousal changes occurred in the anterior vaginal wall.

Introduction

These changes took place in the vaginal wall itself the engorgement as such is not visible on the imagesthrough the raising of the uterus, displacement of the uterus caused by penetration of the penis, and through gradual filling of the bladder.

Histological studies 1112 and immunohistochemistry 13 have shown that the anterior wall of the vagina has denser innervation than the posterior wall. This is supported by clinical studies 1415 and research into vaginal sensitivity to electric stimuli 16 in which the anterior vaginal wall-with the urethra behind it-was found to be relatively sensitive.

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Hoch's concept of a clitoral-vaginal sensory arm of the orgasmic reflex refers specifically to the anterior vaginal wall and the deeper tissues-the urinary bladder, the periurethral tissues, and Halban's fascia 15 -and our images support this. What started as artistic and scientific curiosity has now been realised.

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It has been extremely difficult to investigate anatomical changes during the act of coitus and the female sexual response. Modern magnetic resonance imaging allows exploration of cts of living anatomy.

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Taking MR images of the male and female genitals during coitus is feasible. During female sexual arousal without intercourse the uterus rises and the anterior vaginal wall lengthens. The Polish-German physician and philosopher Ludwik Fleck used images of female genital anatomy to illustrate the cultural conditioning of scientific knowledge.

We thank our volunteers for their cooperation, laughter, and permission to publish intimate MR images of them; those hospital officials on duty who had the intellectual courage to allow us to continue this search despite obtrusive and sniffing press hounds; Professor J Kremer for his encouragement to use the scanner to study female sexology and for his critical reading the typescript; and Professor W Mali for offering the use of equipment at the University Hospital Utrecht.

P van Andel does not want to be acknowledged for his idea of using MRI to study coitus. Funding:No additional funding. Competing interests: None declared. National Center for Biotechnology InformationU. Journal List BMJ v. Willibrord Weijmar Schultzassociate professor of gynaecologya Pek van Andelphysiologistb Ida Sabelisanthropologistd and Eduard Mooyaartradiologist c.

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Author information Copyright and License information Disclaimer. Contributed by Contributors: WWS initiated and coordinated the formulation of the study hypothesis, designed the protocol, and participated in data collection, interpretation of the findings, and writing of the paper; he is guarantor of the study. Correspondence to: W Weijmar Schultz ln. This article has been cited by other articles in PMC. Abstract 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.

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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. Conclusion Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.

Results for : xray

Open in a separate window. Figure 1. Figure 2. Subjects and methods The participants pairs of men and women were recruited by personal invitation and through a local scientific television programme. Results Thirteen experiments were performed with eight couples three couples performed two experiments each and three single women.

Figure 3.

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Figure 4. Anatomy revealed The hypothesised anatomy of human coitus, as drawn by Leonardo da Vinci in about and by Dickinson incould be tested with magnetic resonance imaging. Changes during sexual arousal Magnetic resonance imaging showed strikingly that during female sexual arousal changes occurred in the anterior vaginal wall. Conclusion What started as artistic and scientific curiosity has now been realised.

What is already known on this topic It has been extremely difficult to investigate anatomical changes during the act of coitus and the female sexual response Modern magnetic resonance imaging allows exploration of cts of living anatomy. Acknowledgments We thank our volunteers for their cooperation, laughter, and permission to publish intimate MR images of them; those hospital officials on duty who had the intellectual courage to allow us to continue this search despite obtrusive and sniffing press hounds; Professor J Kremer for his encouragement to use the scanner to study female sexology and for his critical reading the typescript; and Professor W Mali for offering the use of equipment at the University Hospital Utrecht.

Footnotes Funding:No additional funding. References 1. Chianchi M. Leonardo, the anatomy. Florence: Giunti; Clark K, Pedretti C. London: Phaidon; Dickinson RL. Human sex anatomy, a topographical hand atlas. Human sexual response.

Boston: Little, Brown; The physiology of intravaginal contraception failure. In: Calderone MS, editor. Manual of contraceptive practice.

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Baltimore: Williams and Wilkins; An ultrasound study of human coitus. Sex matters. Amsterdam: Elsevier; Dynamic magnetic resonance imaging MRI with paramagnetic contrastagens: a new concept for evaluation of erectile impotence. Impotence Res. Levin RJ. Sex and the human female reproductive tract-what really happens during and after coitus. Int J Impotence Res. Van Andel P. Anatomy of the unsought finding. Serendipity: origin, history, domains, traditions, appearances and programmability.

Br J Phil Sci.

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