Everyone has something to say about Lindy West polyamory thing so here’s the evolutionary take. First of all, humans really are some of the most monogamous mammals on earth (I’ve written about this before). Second, to the extent that extramarital affairs exist in hunter-gatherer societies, they are usually kept secret and women seem to have as many as men. Third, when a man has two wives or two girlfriends, that’s not called polyamory; that’s polygamy, and in general women accept this only as a last resort when no other eligible men are available (and it’s reserved for the best husbands and hunters only). I’m not quite sure at what point we decided that polygamy for mediocre men is progressive and cool, but I am certainly not letting my husband take on a second wife in the name of sexual liberation.