Involuntary Muscular Contractions

[jtb]

A professor at the University of Sydney was giving a lecture on 'Involuntary Muscular Contractions' to his first year medical students. Realizing 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 asshol_e is doing while you're having an orgasm?'

She replied, 'Probably fishing with his mates.'

It took 45 minutes to restore order in the classroom.........