When people have to share a living space funny situations are bound to happen, and when you factor in sex things are bound to get messy, so many roommates have a signal that tells their roommate not to come in when things are hot and heavy. In other words, they've been Sexiled, and once this is established we are often treated to the sight of the one being Sexiled sitting around waiting to be let back in. Of course, breaking a Sexile is a prime opportunity for hilarity to ensue.