Users can answer a series of questions at their own pace, which they can later match up to other members who've answered the same questions.
Questions range from motivation to how often you keep your promises. Or "The Lover Style Profile Test" lets you gauge your sex style.
OKCupid attracts a large audience because it's completely free and easy to navigate. Users guide themselves through a compatibility check instead of the site popping out random matches.
Some women who took part in an Australian study even said they would never be able to go back to dating straight men at all.