Look down at your package. See any SPINES covering your junk? No? You can thank evolution for that. According to researchers at Stanford University, because of evolution, human penises AREN'T covered in barbs.
Believe it or not, chimpanzee junk IS covered in them. And so is the junk of a lot of other mammals. But they're not like porcupine needles, they're more like small pointy bumps. They're made out of the same protein that makes our fingernails.
And they serve a very clear evolutionary purpose: Male chimps have to compete to fertilize multiple females. The spines on their chimpenises make them mate more quickly, because the spines cover up sensory receptors.
In other words: Chimp humping doesn't feel as good. When chimpanzees evolved, they lost their spines, and that meant sex felt better and lasted longer . . . which actually makes monogamy a more appealing option.
