Most of us use the word vagina to refer to our private parts. But technically, the term describes only the narrow canal that runs inside your body from the vulva (the visible area that includes the inner and outer labia, clitoris, and perineum) to the cervix (the lower portion of the uterus).
...On the inside, that is. What does vary is the vulva. The clitoris ranges from 1 to 1¼ inches (including the hood), the outer labia can be barely there or a few inches long, and the inner labia, which are reminiscent of butterfly wings, might be hidden or hang past the outer lips. Most women's labia aren't perfectly symmetrical — one side is usually bigger than the other.
The shade of your southern region isn't necessarily related to the tone of the rest of your skin. Many light-skinned women have brown or purplish labia, while a darker-hued chick can have a lighter vulva. You also can have different colors in different areas — for example, your labia could be on the darker side yet your perineum could be pale pink.
Usually, the walls of the vagina lie compressed against each other. But when they need to open— to accommodate a tampon or penis—the sides separate and widen, kind of like the way an umbrella opens or a pleated skirt unfolds. The vagina typically swells from half an inch wide to 2 inches wide. And it can get even bigger — after all, a baby might have to pass through it!
As explained above, the vagina is incredibly elastic and can fit a supersize penis — yet it always returns to its usual tightness after sex. But it might be a different story once you pop out a baby, as some moms say they do feel looser. You can tighten up by doing certain exercises.
There's a rumor out there that if you find yourself in a no-booty bout, your vagina will become so tight that getting back in the saddle will hurt. It's totally untrue. While your vaginal muscles may be tense at first, penetration shouldn't be painful at all.