Hi men, meet clitoris! It would be nice for you to be well acquainted with our dear friend.
No, but really, going at us like a drill often results in you paying no attention to our clitoris. It's one of the erogenous zones too — and sometimes the most powerful one at that. A lot of women cannot orgasm from vaginal intercourse alone so remember that clit stimulation is important too.
On the other hand, attacking and flicking too rapidly with aggressive, direct pressure can hurt, so be gentle.