A medical professor was lecturing his 1st year students about 'involuntary muscle contractions'.
To liven up the lesson he asks one of the female students,
"For example, do you know what your ****hole is doing while you're having an orgasm?"
She replies,
"Probably having a pint with his mates".
To liven up the lesson he asks one of the female students,
"For example, do you know what your ****hole is doing while you're having an orgasm?"
She replies,
"Probably having a pint with his mates".