OK, prostitution is illegal in the States. Prostitution is being paid to have sex with a client.
Now, porn actors/actresses are also paid to have sex with other porn actors/actresses. Why is being a porn actor legal and being a prostitute isn't?
[WS:] Would not that have more to do with the rules of admissible evidence rather than the act itself? It would be difficult to prosecute someone based on what he/she reveals about him/herself in a work of art or fiction (no matter how suggestive.) If the cops raided a place where such works of art are being shot, that would be a different story, I presume.
Wojtek