An agony forced on college students and some members of the military. Sex is the main reason to avoid bunking your beds. With the way some bunk beds shake, bunk-bed-sex can be like trying to shag while sitting on top of an ocean buoy. If you have the bottom bunk, you’ll be be the first to know each time your roommate in the upper bunk masturbates. As for drunken hookups, the top bunk presents multiple hazards.