A mix of social networking, compatibility testing, and online dating, Ok Cupid is unusual in that it allows its members to create the matching questions already pre-determined at sites like e Harmony or Chemistry.
Additionally, users can contact anyone on the system whether or not you are matched well as an Enemy, Friend or Partner, and the company boasts a huge, active membership base. It's a bit of an art form now, so I've written a comprehensive how-to: Hacking Ok Cupid to Really Meet Someone A long-time personal favorite, Casual Kiss now offers free dating site memberships again.
Should you decide to sign up for the online dating site I recommend below, be sure to read member profiles carefully as you might come across a lot of fake profiles and women looking for “clients.” Usually, I can spot these profiles pretty easily.
A woman who has only one picture posted, is wearing a tight bikini and making an overly suggestive pose are usually clear signals to steer clear.
(response rate = people who will respond back to you to whom you sent an introduction message). I put it on this list because there are a lot of members in Portugal.