Married couple at a Zoo walks past a gorilla enclo

Married couple at a Zoo walks past a gorilla enclosure.
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'll expose one of my breasts 2 it & see how horny 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 us see what happens.'
The woman exposes both breasts to the gorilla and 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 ,was extremely aroused, breaks free from the enclosure, grabs the woman and starts yanking the clothes off her.
The woman yells: 'Mark , what do I do now? Please, help me!'
Mark replies: 'Now, tell him you have a headache and you're not in mood ..