A zoo had acquired a very rare species of gorilla. Within a few weeks
the gorilla, a female, became very ornery, and difficult to handle.

Upon examination, the zoo veterinarian determined the problem: she was
in heat. What to do? There was no male of this species available.
While reflecting on their problem, the zoo administrators noticed Dave,
an employee responsible for cleaning the animals’ cages. Now Dave, it
was rumored, possessed ample ability to satisfy any female, and he
wasn’t very bright. So the zoo administrators thought they might have a
solution. Perhaps they could entice Dave to satisfy the female gorilla.

So he was approached with a proposition: would he be willing to have sex
with the gorilla — for five hundred bucks? Dave replied that he might
be interested, but would have to think the matter over. The following
day, Dave announced that he would accept their offer, but only under
three conditions:

“First,” he said, “I don’t want to have to kiss her,” and “Second, I
want nothing to do with any offspring that may result from this union.”

The zoo administration quickly acceded to these conditions, but what
could be the third? “Well,” said Dave, “You’ve gotta give me another
week to come up with the five hundred bucks.”