1. The 'vagina' probably isn't what you think
This is one fact that we need to get out of the way. When you talk about the vagina, you might think you're referring to a woman's collective private parts — but you'd be wrong.
Instead, the word vagina actually refers to a specific part of the female reproductive system. It is the muscular tube that runs from the vulva — which refers to the external female genitalia, including the labia and clitoris — to the cervix.
If you were wondering about size, research has found that vaginal depth can range from 2.7 to 3.1 inches. During sexual arousal, it is estimated that its depth can range from 4.3 to 4.7 inches.
