I guess I don’t really understand why you would be so grossed out over sex that it would be that much on your mind. We host and would not host if normal things seemed to gross us out… also humans do tons are tainted “gross”… would you ask they not poop in your toilet?
You are renting a room…when people go on vacations as couples they tend to do vacation things. Most humans won’t make their sexual presence known. Either way, my boyfriend and I have sex while we have guests, we are quiet.