I have a few friends and I like them a lot but they are really strange when it comes to sex. They always ask me and my girlfriend to join them in bed. It is pretty much like an orgy. Another thing that bothers me is that it is all unprotected, which heightens the risk for std transfers. I know for a fact that the girl has AIDS, but sometimes I can't help myself. I just want give up and give into it. Is this normal?