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A professor was giving a lecture on "Involuntary Muscular Contractions"
to his first year med 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 asked,

"Do you have any idea what your asshole is doing while you're
having an orgasm?"

To which she promptly replied,

"Yes. He's out playing golf with his buddies."