The college teacher and the final exams

A college teacher reminds her class of tomorrow's final exam:
- "Now class, I won't tolerate any excuses for you not being here tomorrow.
I might consider a nuclear attack or a serious personal injury or illness,
or a death in your immediate family but that's it! NO other excuses
whatsoever!"
A smarty student in the back of the room, raised his hand and asks:
- "What would you say if tomorrow i said i was suffering from complete and
utter sexual exhaustion?"
The entire class does their best to stifle their laughter and snickering.
When silence is restored, the teacher smiles sympathetically at the student,
shakes her head, and sweetly says:
- "Well, I guess you'd have to write the exam with your other hand."