When Did Sex Become Fun?

(This post originally appeared in the online anthropology magazine SAPIENS. Follow @SAPIENS_org on Twitter to discover more of their work.) There are multiple answers to the question of where we come from: early hominins, monkeys, primordial goo, or the Big Bang, to name a few. Today's answer, though, has probably, just a split second ago, popped into many readers' minds. Today's answer is sexual intercourse, a.k.a. "bleeping." So let's go back to the beginning, hundreds of millions of y