Tom straight free advice... call your local county seats prosecutors office and go have a meeting with the highest guy or woman you can meet with. They will tell you up front as they have enough on their plates without adding some green webmaster that doesn't have any real $$ to fine you for.
They are the ones that know your localities morals better than anyone else. They have to prosecute the crimes involving all of that. It appears you are already worried... so maybe a mainstream site might be better for you.
Kid sites with games and things can turn a few dollars per month and a newbie isn't going to waltz into adult sites and make a ton anyhow. Kids like to click on things and someplace like commission junction has lots of kid oriented affiliate programs to use.
Just be careful with selling the email addies if you collect them from kids. There ARE adult webmasters out there that will spam any age bracket. So try to sell that sort of thing to known safe sites like back to commission junction or one of the other family based aff proggies. There are several large ones.