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In mammalsthe vagina is the elastic, muscular part of the female genital tract. In humans, 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 porn vagina.

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The vagina allows for sexual intercourse and birth. It also channels menstrual flow menseswhich occurs in humans and closely related primates as part of the monthly menstrual cycle.

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Although research on the vagina is especially lacking for different animals, its location, structure and size are documented as varying among species. Female mammals usually have two external openings in the vulva, the urethral opening porn the urinary tract and the vaginal opening for the genital tract.

This is different from male mammals, who usually have a single urethral opening for both urination and reproduction. The vaginal opening is much larger than the nearby urethral opening, and both are lil dicks fuckin by the labia in humans. In amphibiansbirdsreptiles and monotremesthe cloaca is the single external opening for the gastrointestinal tract, the urinary, and reproductive tracts.

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To accommodate smoother penetration of the vagina during sexual intercourse or other sexual activityvaginal moisture increases during sexual arousal in human females and other female mammals. This increase in moisture provides vaginal lubricationwhich reduces friction.

The texture of the vaginal walls creates vajinal for the penis during sexual intercourse and stimulates it toward ejaculationenabling fertilization. Along with pleasure and bonding, women's sexual behavior with others which can include heterosexual or lesbian sexual activity can result in sexually transmitted infections STIsthe risk of which can be reduced by recommended safe sex practices.