STDs Might Have Driven Us to Embrace Monogamy

Exactly why so many humans choose monogamous pair bonds over juggling multiple partners has long been a mystery to scientists. After all, having several partners at the same time should lead to more offspring -- an outcome you'd think evolution would favor. Now a new study has linked the phenomenon to sexually transmitted diseases, arguing that monogamy could have evolved because it offered protection against the threat of infection. Monogamy is, of course, the norm in Western societies. B