A Professor was giving a lecture on "Involuntary Muscular
Contractions"
to his first year medical students.

Realizing that this was not the most riveting subject, the Professor
decided
to lighten the mood slightly.

He pointed to a young woman in the front row and said, "Do you know
what
your ass hole is doing while you're having an orgasm?"

She replied, "Probably deer hunting with his buddies."