I made the biggest deal out of one of my daughters having her boyfriend (both in college) in her bedroom at our house. I made her leave the door open and checked on them frequently. Why? I'm not really sure! It's what my parents would have done? By the time my son, the youngest, had his girlfriend over they went to his room and shut the door and I never said a word. My poor daughter got the shaft! She did not marry that guy but my son did marry his girlfriend.