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The '''vagina''' is the elastic, muscular part of the female genital tract. It extends from the vulva to the cervix. The outer vaginal opening is normally partly covered by a membrane called the hymen. At the deep end, the cervix (neck of the uterus) bulges into the vagina. 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 peni] penis during sexual intercourse and stimulates it toward ejaculation, enabling fertilization.
==Function of the male foreskin==