A university professor was giving a lecture on involuntary muscle contractions to his fifth year med students,
Realising it was not the most riveting of subjects, the professor decided to lighten the mood slightly,
He pointed to a young woman on the front row and said 'do you know what your arsehole is doing while you are having an orgasm?'
She replied - ' most likely fishing with his mates '
It took 30 minutes to restore order in the room !!!!
