Hi. I work at OkCupid. I coud have saved you a lot of trouble. Your results confirm what all dating web sites have always known, and which we've made no secret about: Nearly all initial messages are sent by men. This does not mean that the site is "better" for women than for men, relative to any other form of heterosexual courtship. It's a deeply ingrained cultural, and perhaps biological, norm that men make proposal…
I am curious: Are there any variables which, after you control for them, make this go away or diminish? i.e., high income, feminist leanings, political beliefs, etc. ?