Change boyfriends! This one obviously doesn't respect you. It can happen very easily and most embarrassing. If you are 17 plus I am sure if she is a wise mom that she expects her son will have sex, but doesn't really want to have to look at that ugly scene. LOL Sex is private and neither of your homes is the place to have it as it's disrespecful to your parents. Think! If you insist on having sex, then see a doctor and discuss birth control pills and ALWAYS have a male partner wear a condom because of sexually transmitted diseases.