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}}</ref> The vagina allows for sexual intercourse and birth.
The vagina receives the [[penis]] during [[sexual intercourse]]. To accommodate smoother penetration of the vagina during sexual intercourse or other sexual activity, vaginal moisture increases during sexual arousal in human females. This increase in moisture provides vaginal lubrication, which reduces friction. The texture of the vaginal walls creates friction for the [[penis ]] during sexual intercourse and stimulates it toward [[ejaculation]], enabling fertilization.
==History==
Knowledge of the overwhelming superiority of the [[intact]], [[foreskinned]] [[penis]] over the [[circumcised]] penis in assuring the pleasure and orgasm of the female partner is of long standing. Rabbi Isaac ben Yedaiah, who lived in Southern France in the late 13th century, wrote effusively of the pleasures that the [[foreskin]] provided to the woman. Marc Saperstein (1980) provided a translation:
==Function of the male foreskin==
Warren & Bigelow (1994) reported the [[foreskin]] "provides slack [[shaft skin|skin on the shaft]] of the erect [[penis ]] allowing it to [[Gliding action| glide]] within its own sheath of [[skin]] during intercourse, one effect of which is to conserve vaginal lubrication. The gliding of the foreskin eases penetration<ref name="taves2002">{{REFjournal
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