A professor was giving a lecture to a class of fir
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medical students. When he got to a part that dealt with
involuntary muscle contractions, the students attention
started to drift from boredom, so he decided to lighten
the mood. Pointing to an attractive woman in the front
row, he said "what do you suspect your asshole is
doing at the moment you reach an orgasm?"
"Well, he is probably playing golf with his friends," she
replied. "But if you mean my sphincter, it is probably
undergoing involuntary muscular contractions."