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"