Perhaps this should be part of a young persons sex education at school. After learning about the ideal relationship to be in they could touch on the subject not just the moral or immoral side in an unbiased way explaining the dangers that comes with prostitution. At the same time explain the law side of things. It might deter people contemplating doing it but it should be fair to teach them their rights in law even though ideally society would rather they steer away from the idea.