MIT TECHNOLOGY REVIEW - Oct 2 - One of the curious features of human courtship is the asymmetry between the roles that men and women play. In recent years, researchers have begun to study this phenomenon in more detail, thanks to the rise of online dating. These show that in general, men tend to initiate contact, and women, often flooded with contacts, are more selective with their responses. Rachel Dinh and colleagues at the University of Oxford in the UK measured the change in online dating behavior on eHarmony's UK site over a 10-year period. They found out that the asymmetry has become more pronounced. "While early on, people might have hoped online dating would create a more equal playing field for women to initiate courtship, it has become clear that online dating has not only reflected but exacerbated male-dominated initiation," say Dinh and co.