Diagram of a penis in a vagina



How the vaginal changes during the menstrual cycle The vagina also changes throughout the month in response to hormonal fluctuations of the cycle. Thirteen experiments were performed with eight couples three couples performed two experiments each and three single women. The physiology of intravaginal contraception failure. Sex and the human female reproductive tract—what really happens during and after coitus.



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Diagram of a penis in a vagina

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

This article has been cited by other articles in PMC. It has been extremely difficult to investigate anatomical changes during the act of coitus and the female sexual response. In all the experiments this phenomenon occurred in this coital position and was not related to the depth of penetration.

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Midsagittal image of the anatomy of sexual intercourse experiment When sexual excitement without orgasm occurred, the volume returned to normal in minutes. Anatomical relationship between urethra and clitoris.

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