Professor Higgins was at the University of Sydney and on this particular morning was giving a longish lecture on Involuntary Muscle Contraction to his first year medical students.

Realizing that his class of students were looking some what bored and he was not talking about the most riveting of subjects, the professor decided to lighten the mood slightly by asking the class questions on the subject.

He pointed to a young woman in the front row and said, madam have you any idea what your arsehole is doing while you're having an orgasm?'

Without a second thought she replied, More then likely playing golf with his mates.

It took 45 minutes to restore order in the classroom!

good one