How does the vagina function during sex?

Anonymous
i always hear that the average vagina is 4 inches long when not aroused. 6 inches when aroused, but I always hear that the average vagina can accommodate a size 9 inch penis. how is this possible? cause I also hear women complaining how 9 inches is too much for them... this is the site that says all of that, but are they right? link
How does the vagina function during sex?
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