"Animal Marital Aides" joke

It's a beautiful spring day and a man and his wife are at the zoo.
She's got on a close-fitting, lowcut, pink summer dress with spaghetti straps.
As they walk thru the ape exhibit, and pass in front of a very large gorilla, the gorilla goes ape.
He jumps up on the bars, he grunts, he pounds his chest.
He is obviously excited at the sight of the young lady in the sundress.
The husband, noticing the apes excitement,
suggests that his wife tease the ape.
The husband suggests that she pucker her lips and wiggle her bottom.
She does, and Mr. Gorilla gets even more excited,
making noises that would wake the dead.
Then her husband suggests that she let one of the straps of her dress slip down.
She does and Mr. Gorilla is about to tear down the bars.
Her husband suggests she lift her dress up her thighs and she does.
This about drives Mr. Gorilla crazy.
Then quickly the husband grabs his wife, rips open the door to the cage, flings her inside with the gorilla, slams the door shut, and gleefully rubbing his hands together, says:
"Now, tell him you have a headache."