<p>You gotta set some ground rules…but no sexual activity? Where are you supposed to do it? If you set it that strict, its just gonna get broken</p>
<p>Maybe you could try a signal on the door and have an attatched time limit if you knock…If you’re out and the roommate brings a girl back and puts the sign on the door or whatever, knock on the door but then go hang out in the commons for 15 minutes or half an hour or something. You know you wouldnt want an immediate interruption if you were the one in the room.</p>
<p>If you really just need to get something from the room…just do like they do in the movie Sideways ;)</p>