Humans have a tendency to be a bit obsessed about sex. But, we generally (and thankfully) tend to inflict our sexual prowess only on members of our own species. Except maybe extending that to include the odd Neanderthal or two.

But, our sex drive didn’t stop there, it may be that ancestral humans mated with chimpanzees.

Yup – chimp ancestors and human ancestors got it on. It may sound gross, but it isn’t. It’s science.

_{Host: Torah Kachur}

_{Photo credits: fedpost.ru, scitoys.com, nytimes.com, Harvard.com, nature.com, Wikimedia user: J.J.,}

_{References:
http://www.nytimes.com/2006/12/10/magazine/10Section2a.t-5.html
http://www.nytimes.com/2006/05/18/science/18evolve.html?fta=y
N. Patterson et al. "Genetic evidence for complex speciation of humans and chimpanzees," Nature, published online May 17, 2006.}