The logic of this isn’t particularly hard to understand, but the implications can be surprising. As Geoffrey Miller argues in The Mating Mind, “Our minds evolved not just as survival machines, but as courtship machines,” and many of our most distinctive behaviors serve reproductive rather than survival ends. There are good reasons to believe, for example, that our capacities for visual art, music, storytelling, and humor function in large part as elaborate mating displays, not unlike the peacock’s tail.
