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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 Penis in vagina xray formulation of the study Penis in vagina xray, 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. Thirteen experiments were performed with eight couples and three single women.

During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened.

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The size of the uterus did not increase during sexual arousal. Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.

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The semen was supposed to come down from the brain through a channel which can be seen in the spine of the man. In the woman the right lactiferous duct is depicted as originating in the right female breast Penis in vagina xray ending in the genital area. Even a genius like Leonardo da Vinci distorted men's and women's bodies—as seen now—to fit the ideology of his time and to the notions of his colleagues, who he paid tribute to.

This increase disappeared minutes after orgasm. When sexual excitement without orgasm occurred, the volume returned to normal in minutes. Masters and Johnson presumed that the greater volume of the uterus was due to engorgement with blood. However, they qualified their presumption: In Riley et al published an ultrasound study on copulation.

We used magnetic resonance imaging Penis in vagina xray study the anatomy and physiology of human sexual intercourse. 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.

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.

The participants pairs of men and women were recruited by personal invitation and through a local scientific television programme.

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Respondents were invited to participate if they met the following criteria: The experimental procedure was explained in a letter sent to respondents along with an informed consent form.

Participants were assured confidentiality, privacy, anonymity, and the possibility of withdrawing from the study at any time. After written informed consent had been obtained, the participants were invited to come for a scan when the equipment was available on a Saturday. The tube in which the couple would have intercourse stood in a room next to a control room where the searchers were sitting behind the scanning console and screen.

An improvised curtain covered the window between the two rooms, so the intercom was the only means of communication.

Imaging was first done in a 1. To increase the space in the tube, the table was removed: The participants were asked to lie with pelvises near the marked centre of the tube and not to move during imaging.

The echo time was 64 ms, with a repetition time of 4. With this fast acquisition technique, 11 slices of relatively good quality were obtained within 14 seconds. The volunteers were shown the equipment in the two rooms, and personal and gynaecological histories were taken. The experimental procedure was explained, and all investigators left the imaging room. After a preliminary image for positioning the true pelvis Penis in vagina xray the woman was taken, the first image was taken with her lying on her back image 1.

Then the male was asked to climb into the Penis in vagina xray and begin face to face coitus in the superior position image 2. After this shot—successful or not—the man was asked to leave the tube and the woman was asked to stimulate her clitoris manually and to inform the researchers by intercom when she had reached the preorgasmic stage.

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Then she stopped the autostimulation for a third image image 3. After that image was taken the woman restarted the stimulation to achieve an orgasm. Twenty minutes after the orgasm, the fourth image was taken image 4. At the end of the experiment, the images were evaluated in the presence of the participants. Thirteen experiments were performed with eight couples three couples performed two experiments each and three single women.

On two Saturdays in experiments 1 and 2 the first couple succeeded with complete penetration that lasted sufficiently long for the images to be taken. This gave low quality images with many movement artefacts. In the Siemens Vision 1. Six couples succeeded in partial, though not Penis in vagina xray, penetration experiments 3 and In sildenafil Viagra became available in the Netherlands.

The two couples in experiments 9 and 11 Penis in vagina xray invited to repeat the procedure one hour after the man had taken one 25 mg tablet of sildenafil. They succeeded with complete penetration that lasted Penis in vagina xray enough 12 seconds for sharp images to be taken experiments 12 and In all the experiments this phenomenon occurred in this coital position and was not related to the depth of penetration.

During intromission the pubic bones of the men and the women did not approach each other closely: The uterus was raised by 2. The changed configuration of the bladder was caused by penile stretching of the anterior vaginal wall during intromission, plus the raising of the uterus and the increase in bladder size as it filled.

The subjective level of sexual arousal of the participants, men and women, during the experiment was described afterwards as average.

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Midsagittal Penis in vagina xray of the anatomy of sexual intercourse experiment In the pre-orgasmic phase the anterior vaginal wall lengthened by 1 cm and the uterus rose within the pelvis. This is a typical response in all experiments except one experiment During sexual arousal without coitus, the position and size of the uterus hardly changed.


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