In mammals , the 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 the vagina. The vagina allows for sexual intercourse and birth. It also channels menstrual flow menses , which 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. Female mammals usually have two external openings in the vulva, the urethral opening for the urinary tract and the vaginal opening for the genital tract.

It's not a black hole
No, women do not pee from their vaginas
While men do pee out of the penis, women do not pee out of the vagina. There are three holes. Learn to know your anatomy. Get a hand mirror and go to town. From front to back, the urethra is the first hole, the vagina is the second, and the anus is the third. Reach in all the way and pull it out. Think of your vagina as being like a sock.
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There are so many parts and structures that make up the female sexual and reproductive anatomy, so you get a pass if you aren't deeply familiar with each and every one. No, what you see on the outside is NOT your vagina. Despite popular use, vagina isn't a general word for the entire swath of bodily real estate below your hips and above your thighs. Vulva is the general term for the external parts of the female sexual anatomy. The vagina itself is a tube that connects the vulva to the cervix and uterus, and serves as the birth canal during labor and is where menstrual blood flows from during a period. The only part of the vagina you can actually see externally is the vaginal opening. The opening is the hole of which you have three, counting the opening of the urethra and the anus that you can see on the vulva, and is how you insert everything from tampons and menstrual cups to fingers and penises.
One user, a nurse, recalls how a year-old patient 25! She was wrong but, alas, she is not alone. Men in particular seem very shocked to learn this information.