I know Nevada is one of the states (and there, the legality is determined by the county, and then, it's only in established "houses," not street walkers). What's the other state?
Alaska has "decriminalized" prostitution, although I don't believe there are regulated brothels. In other words, escort services are not only tolerated, they are 100% legal. Any Alaska Freepers want to comment?
BTW: I don't think anyone who wants to legalize prostitution has street walkers in mind. The Netherlands, Belgium, most countries in Latin America, among others, have it in regulated brothels, like much of Nevada.