WHY WE CARE about other people’s sex lives. I don’t particularly, except for a general hope that they’re having fun. But, then, I’m a man: “Although the stakes may have changed, sexual judgment remains a form of self-preservation. The Archives of Sexual Behavior study isn’t the first to posit that women, in particular, are hardwired to slut-shame out of self-interest (among the judgers, women were more opposed to casual sex than men).”