Ah, the wonders of the internet. You start out with some very basic questions about human evolution and wind up looking at strange cartoon pictures of sexuality. Delightful.
Now, I assure you, I did not begin my journey through the bowels of Wikipedia with the express intention of seeing cartoon men (and some women) ejaculate onto each other in a variety of interesting ways. But once I found my way down that fascinating hallway of animated splooge, I simply couldn’t resist clicking on every new and wonderful term I came across.