There's a site that is trying this (not letting men message women until the woman gives permission). I tried it out but there were only about 20 female profiles

There's a site that is trying this (not letting men message women until the woman gives permission). I tried it out but there were only about 20 female profiles in my area (a large coastal metro) and most of them were inactive. The ones who were active were unattractive and their profiles were all of the "I'm an easy-going girl who loves to laugh" variety. I'm not sure if that's a result of the approach or just a marketing problem on the part of that site in particular.