Because they don't allow pets in dorm rooms

I have a friend, who shall remain nameless (but she knows who she is), who's a professor at a, shall we say, highly esteemed institute of higher learning.

Graduate degree... $200,000
Tie on the doorknob... $25
Saying the following to your professor with a straight face... priceless

"Sorry my paper is late, I was sexiled yesterday - my roommate was using the room to have sex. So I had to spend the night on the couch in the dorm lounge."

Brings a whole new meaning to sexile dysfunction.