Sexual Exhaustion?

A high school English teacher reminds her class of tomorrow's final exam. She tells the class there would be no excuse for not showing up, except for serious injury or illness, or a death in the student's immediate family. A smart-ass jock in the back of the room asks, "What about extreme sexual exhaustion?"
The entire class does its best to stifle their laughter and snickering. When silence is restored, the teacher smiles sympathetically at the student, shakes her head, and sweetly says, "Not an excuse. Write with your other hand."