Studies of speed dating have shown that men typically ask for follow-ups with about half of the women they spend a few minutes with, while women only want to follow up with about a third of men. This is easy for the "evolution is psychology" crowd to explain: females are almost always pickier than males in choosing mates because they have to make a greater investment in any offspring that result.
Except it turns out that explanation is wrong, or at least suspect. As Nature reports
, speed dating services typically have women stay seated while men walk around. Reverse that, and the follow-up rates even out. Who'd a thunk it?