Adult-child relationships are illegal. Well, the sexual kind at least, and your site is about dating, so a sexual intent is implicit there.

Now, I'm not a lawyer, but I don't think it's okay to build a platform that encourages behavior that is punished by the law.

Even if you said your platform was all about pursuing purely romantic and not at all sexual relationships with little girls AND you somehow got LEA to buy into that, you'd still get a mob of angry people that will not stop protesting until your site is taken down.

I'm not trying to say your idea is right or wrong here. I'm just saying it's hella crazy, that's all.

Now I want to test your resolve a little bit by asking: Why?

Why are you doing this? Why put yourself in danger or, at the very least, attract unwanted attention your way just for this?