Final Exam

A university lecturer reminds her students of next day’s final exam.
"Now, 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 smart-arse bloke 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 its best to stifle their laughter.
When silence is restored, the lecturer smiles sympathetically at the student, shakes her head, and sweetly says, "Well, I suppose you'd have to write the exam with your other hand."