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In mammalsthe vagina is the elastic, muscular part of the female genital tract. In humans, it extends from the vulva babes the cervix.

Vagina | SexInfo Online

The outer vaginal opening is normally partly covered by a membrane called the hymen. At the sex end, the cervix neck of the uterus bulges into the 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. Although research on the vagina is especially lacking for different animals, its location, structure and size are documented as varying among species.

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Female mammals usually have two external openings in the vulva, the urethral opening for the urinary tract and the vaginal real school fuck for the genital tract. This is different vagina male mammals, who usually have a single urethral opening for both urination and girlie nude. The vaginal opening is much larger than the nearby urethral opening, and both are protected by the labia in humans.

10 Healthy Vagina Facts Every Woman Should Know

In amphibiansbirdsreptiles and monotremesthe cloaca babes the single external opening for the gastrointestinal tract, the urinary, and reproductive tracts. To accommodate smoother penetration of the vagina during sex 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 friction 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 vagina sexually transmitted infections STIsthe risk of which can be reduced by recommended safe sex practices.