Yeah thats one way..
1. You are not asking them to suck dudes dicks. You are asking them to adult modeling and acting professionally. They either know what that means or they don't. UNLESS the girl is AMAZINGlY HOT, if she does not already know what it entails, then don't bother with her.
2.
http://www.adultweblaw.com/
3. If you have all the correct docs, and good lighting and girls and the action is good, then you can sell them on the boards, But DONT SPAM THE BOARDS.