During his research into pleasure centers in the brain, neuroscientist Jim Pfaus noticed that the same areas of the brain activate with clitoral stimulation—regardless of species. He asserts that while humans may have larger cortexes, our lower brains aren’t that different from our other animal relatives. As he puts it, “Mother Nature loves a keeper.”

More videos from this series: The Origins of Orientation

Image courtesy of Sarah Fleming; Recorded June 2011; Posted September 2011