Why does it hurt when we have sex?

my names danielle im 19years old an I have a boyfriend who I've been wiv for 5 years an I got 2 kids wiv well anyways when we have verginal sexual intercource its fine getting it in that dont hurt but when were doing it it feels like hes hitting something he souldnt an watever it is it really hurts so we cant enjoy our selves do you know the reason why for this please get bk to me when you can thanks

Dear shyme,
The vagina is only 4 inches long...so if the average man is 6 inches...then we can begin to see a problem. For some during intercourse with heavy thrusting the pen*s will hit up against the cervix and beyond causing pain. If your man is very large adult stores sell 'spacers' for the men to stop them from such deep penetration. Teaching your man by telling him how far he can go without pain is a must. Try being on top so you are in full control.
Sue...good luck

Dear