Very first non-content-free sentence on the site's front page: "Ever want to ask someone out, but are afraid of getting rejected? This site is your solution!"

The whole point is the "afraid of getting rejected" bit. (Well, I guess there are other reasons besides fear of rejection why you might want someone not to know you wanted to "hook up" with them unless it was mutual. For instance: consider someone who has a partner, wants to have an affair with someone else, but doesn't want anyone to know they're willing to be unfaithful unless they won't mind that. I make no comment on the ethics of this.)