In Sweden, prostitution is not illegal, but being a pimp and frequenting a prostitute are illegal. Imagine the wonderful nature of your transaction of: "if you stiff me, I can call the cops, and they'll arrest you, and I walk away." Clients won't screw their prostitutes in this case. The same with pimps. "Go ahead, slap me... I'll call the cops, and they'll haul you away, and I can admit openly that I'm a prostitute, and I won't get taken away."
How about making prostitution a SAFE profession, rather than demanding it be illegal to stop people from doing it? If you're concerned about their health from the sex alone, either physical and/or mental, then when shall we expect an intent to make promiscuity itself illegal?
reminds me of a documentary where a camera crew was tagging along to an early morning bust of illegal (Mexican) workers at a few plants in California; targeting 'the worker' (instead of the corporations) seemed a clear proponent to imposing and sustaining horrible working (and even living) conditions onto the workforce