Hot Monkey Sex
I was listening to Penn Jillette's new pod cast Penn's Sunday School
and he was talking about this study where they taught capuchin monkeys to use money. Here's a quote for the New York Times article
on the study:
During the chaos in the monkey cage, Chen saw something out of the corner of his eye that he would later try to play down but in his heart of hearts he knew to be true. What he witnessed was probably the first observed exchange of money for sex in the history of monkeykind.
The first monkey to work for money did it on her back, there is a reason it is called the oldest profession.