Was money involved, or was this simply asking a willing participant (or in this case, someone pretending to be willing) to later engage in private sex? If it's the latter, then this doesn't sit right with me. It sounds like an infringement of basic rights of speech and association.
No, there was no money offered or involved. It's a crime there, in a public place, to ask anyone to have sex with you, even if the sex is to be had in your bedroom with no coercion or money involved. Interesting.