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Agreeing to pay for a massage is not illegal. There are plenty of people that are paid for giving massages.
Also trying to set up a meeting for NSA sex is legal, so there is no issue there.
Asking you if you are willing to pay for sex though is not entrapment, not in this situation. Many people that go to craigslist start their ads for NSA sexual encounters, because it makes no sense to post an illegal request for money in exchange for sex.
So, it would not be entrapment for an uncover officer to, essentially, feel you out to see if that is what you are interested in. Entrapment requires a considerable amount of pressure to convince you to do something that you were not predisposed to do. For instance, someone friending you on facebook and then repeatedly asking if you'd like to pay for sex with them, again and again, over weeks. They keep lowering their price until finally, almost as a method of getting them to stop asking, you agree. That's entrapment.
A single question is not.
All that said, your facts do not describe any illegal act on your part here.