I had email correspondence with two women who work together (ads on BP) and they both asked for detailed specifics about what I was looking for.  I decided there was a not insignificant chance of police entrapment and so broke it off, although I suppose they could have been worried about me being the police and thought getting what I wanted in writing would mean that I wasn't the police.  I don't think that would protect them though as I am sure the police would be happy to tell them exactly what they wanted before they busted them.