The Other Hand

An attractive young female professor announces a test
that would begin the next morning. No rain or Tyre puncture reason.
Be there or get a zero.

A young man in the back raises his hand, winks at the professor and

says "But what if we're incapable of taking the test tomorrow due to

extreme, crippling sexual exhaustion?"

The professor replies, "Then I suppose you'll have to write the answers with your other hand."