what is the average vagina depth of a woman when aroused... so how long does a penis have to be before it starts hurting?
It varies from woman to woman... but unless there is a medical problem (tilted cervix, etc.) any vagina (when properly aroused) should be able to take any size penis, within reason... I mean, a lot of times you hear about a girl saying she can't. Well, it's either because she's not relaxed, or fully aroused, lacks lubrication, or is just simply not physically developed yet. In some positions a penis (especially a larger or longer one) may bump a wall or something that may hurt, but that's just because of the angle, etc. and is completely normal.
i am a guy and ill tell u bout my experience with it. my penis is only 7" long and it hits the back of my gf vagina and she moves when i hit it cause it hurts so hers is bout 6.75 inches deep.