Try this one: http://www.bayswan.org/

The short version is: prostitution is illegal here, but the vast majority of women who do it don't ever get arrested.  I have been an escort for ten years and I haven't, and I hardly have ever met any girl who had. You have to be careful where you put ads and what you say on the phone, but it's manageable.

Even if police really wanted to arrest every sex worker, which they don't, they don't have the time and money to do so. So the street girls get hassled some, and now and then (usually around election time) the cops in any given city will bust a couple of higher-profile escort services or massage parlors. But it's not common for women who work inside to have trouble.

Some cities are more conservative that others. If you're in NY or San Francisco, you're unlikely to have trouble. A very conservative city like, say, Cincinnati? You have to be more careful.

Hope that's helpful.