There are several relatively lucrative ways to sell your body without ending up handcuffed in the back of a patrol car at one o'clock in the morning, screaming for your mama. Even if you've got no education and no marketable skills, you can still make a few bucks here and there by selling yourself—all perfectly legal, I assure you.
Are you going to make a healthy living using one, two or all of these methods? No, you're not. But you can pick up some extra cash along the way, and that's never a bad thing.