No Kidding, It Really Is One Of The World's Oldest Professions

So, there's these researchers at Yale, led by Keith Chen, who have been experimenting with monkey psychology for years. One of the things they've been working on is teaching the monkeys a primitive monetary system; using tokens earned through various activities, the monkeys can buy food.

...They've noticed that monkeys DON'T save - but they DO steal; the monkeys have been observed to swipe each other's tokens for extra chow.

Now, you and I, being normal people, may be inclined to think this is simply learned behavior, instead of a true understanding of the function of money.

...Until the researchers witnessed one monkey paying another monkey for sex.

...And the second monkey used the tokens to buy food.

No matter where we build a society, there's always gonna be hookers, I guess.