Ever since Darwin popped off his big theory of evolution, we've all kind of presumed that everything we do -- the way we eat, the mates we choose, the way we purposely mispronounce "indubitably" for laughs, everything -- is ultimately tied to one goal: continuing the species.
But sometimes getting from A to Baby isn't as intuitive as you'd think. And scientists have had a hell of a time figuring out why.
Now, we're not saying that these theories behind our sexual behaviors are the gospel truth or that there aren't other, conflicting theories out there. But if they are true, sex is even weirder than we thought.