I am a 20 years old female. My boyfriend is from the same college as I. We have not been dating for too long. It has been a few months. He is otherwise a nice guy, and we are pretty good friends but while we make out he has a tendency to bite me and slap my body which actually hurts me. I have spoken to him about this but he says that unless he does that he can't reach his climax. Is this normal?