My girlfriend and I live at home with her parents. I'm in college and commute to school. This way we both can save a lot of money while I'm in school for the next handful of years (I want to be a doctor, phew!). While we try to contain our playtime to when no one is home, sometimes we slip up and can't help it. Most of the time we will turn on the TV louder and try to keep quiet. I've been trying to convince her to find an apartment with me because I'm not a fan of sneaking around, but she doesn't want to yet. Is it wrong for us to have sex with her parents and younger brother sleeping down the hall from us? Or is it a "what they don't know won't hurt them" kind of thing?