I agree with you, I probably shouldn't have said "on OkCupid". This is far from the root issue, but it's also hard not to fall into uninteresting generalizations, like
"the real issue here is the objectification of women in the western civilization" or "the real issue here is the place of woman in society".
Thinking about it, I can't think of a single animal species where the female is the one seeking out the males.
I couldn't find anything either after a (quick) Google search, so you might be right about that. But it doesn't mean that we are bound to act forever the same, and I think that it's not the case in some (nordic?) countries (although it might be an urban legend, maybe someone can chime in with real world data / observations).