Tufts University has just instituted a policy you'd think wouldn't need to be an official rule: don't have sex in your dorm room while your roommate's present, and don't "sexile" (sex + exile) your roommate, say at 3 a.m., because you want to get it on with your college sweetheart (or random hookup). So basically, if you're dwelling in a dorm, either have enough money to get a hotel room, find a comfy broom closet if passion strikes, or go without.
The Tufts policy arose because students were complaining that their horny roommates were intruding on their privacy and interfering with their studies by either having sex while they were present (ewww!) or asking them to leave for a few minutes. I am so glad I never stayed in a dorm — I just moved in with the boyfriend when I was in college! Problem solved.
How was dorm sex negotiated when you were in college?