I can't take credit for it, I got it from a post of Scripter's! I saved it for when people trot out those "bonobos are homos so it much be normal and natural" arguments.
Bringing out that kind of argument is absurd. Dogs pee on fire hydrants; should we as well?
Also.....that kind of argument is the same as saying: "let's bring our behavior and expectations down to the lowest common denominator."