Folks, did you know that there are technically 2 holes in the vagina? Crazy, right?! I was unaware, myself.
This is why we should look more closely at one of the most talked about part of the body: the vagina.
[Imagine I've got a laser pointer and I'm wearing a lab coat. It's cooler that way].
I'll be going through each part of this and giving a brief explanation of what it does.
The uterus is the muscular organ where the embryo and fetus are taken care of and where they grow, it's also where IUDs are placed to block off spermies from gettin to the fallopian tubes. Lots of folks think that babies are really from someone's tummy, but it's actually much farther down, and the belly button has nothing to do with it.
The fallopian tubes connect the uterus to the ovaries, the egg cells responsible for making babies. These tubes and the egg are the primary destination for spermies to get to, and where the eggs move down during menstruation/periods.
Prior to having penetrative sex, the hymen is usually a half moon-shaped thin membrane that allows menstruation flow. During sex, the hymen breaks due to the penetration. Sometimes with enough lubrication and relaxation, people can have sex without the hymen breaking. But it's not only sex that breaks a hymen. One can break their hymen from using a tampon, riding a bike, and experimenting with sex toys.
There are also multiple kinds of hymens such as imperforate hymens, one that covers the entire vaginal opening with the exception of one small hole that allows some menstrual blood to flow through. For more, follow the Young Women's Health link below!
*edited 8/30/14* Here's a SciShow video that talks about the clitoris!