College humor

A college professor had just finished explaining an important research
project to his class. He emphasized that this paper was an absolute
requirement for passing his class, and there would be only two
acceptable excuses for being late. Those were a medically certifiable
illness or a death in the student's immediate family. A wisecracking
student in the back of the classroom waved his hand and spoke up "But
what about extreme sexual exhaustion, professor?" As you would expect,
the class exploded in laughter. When the students finally settled down,
the professor gave the student a long, appraising look. "Well", he
responded, "I guess you'll just have to write with your other hand".