Involuntary Muscular Contractions

#1
A professor was lecturing to a group of first year medical students on the subject of "Involuntary Muscular Contractions"
Realising 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 arsehole is doing while you're having an orgasm ?"
*
She replied
*
"Probably drinking beer and getting pissed with his mates"
 

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