The Vagina Can Double In Length When A Woman Is Aroused

No two vaginas are the same; some are very small, some short, some long, some roomier… well you get the idea. The average length of an unaroused vagina is 3-4 inches but when things get heated this number can grow and even double! So make sure you (or your partner) are aroused before penetration because it’ll probably make sex a lot more comfortable and deeper penetration will feel better.

Source: The Female Response