On Tinder, for example, many men “swipe right” on dozens or hundreds of profiles each day, hoping that one or a few might respond in kind. In contrast, one woman who used Tinder exclusively for short-term mating told me that she swiped right on less than 0.8 percent of men she saw on the site and hooked up with only 0.6 percent of those, resulting in a minuscule 0.005 percent of men she saw on the dating app.

