Of Apes and Men

A married couple walks past a gorilla enclosure, at the Zoo.
Says the woman, “Mark, do you know that gorillas are the only animals which resemble men in their behavior? Look, seeing that no one is looking, I will expose one of my breasts, and see how excited it gets, just as men do.”
Mary then exposes one of her breasts, and sure enough the gorilla gets excited and grabs the bars of the enclosure as if it wanted to break free.
See, says the woman, “Now, I know why you react the way you do. Men can’t control their animal instincts, just like gorillas can’t.”
Says Mark, “Now expose both breasts, and let’s see what happens.”
The woman exposes both breasts to the gorilla. It gets very excited, and is now desperately trying to escape from the enclosure.
Says Mark, “This is incredible!! Now, pull your skirt up, turn around and expose your bum, and let us see what happens!”
The woman pulls her skirt up, turns around with her bum to the gorilla, which by now, is extremely aroused, breaks free from the enclosure, grabs the woman, and starts ripping the clothes off her.
The woman yells. “Mark, what do I do now? Help me!”
Mark replies, “Tell him you have a headache and you are not in the mood. Now let us see if gorillas and men are the same!”