Say goodbye to your love life and hello to theirs. You've spent your university life knowing whenever your roommate was having sex and that was okay because they were your roommates, but now, it's your parents. And you want to die. Plus, you can't invite anyone round to the house now without declaring that the both of you are 'just friends', otherwise you'll have to leave the door open whenever you have a girl/boy round. And one night stands are clearly out of the question.