Exactly, my parents are fine with the idea of my girlfriend and I having sex in their own house when they are home. My room is on the other side of the house and my parents know that we do, I mean come on we both have slept at each others' house many times. They honestly don't have a problem with it. Actually both of our parent's are fine with us having sex and know that we do. As for noise I do give her a pillow or two.