While LE can push and pursue any way they want, they need more evidence than her word, even if it is supported to some correspondence, to charge you and make it stick. But there are all sorts of exceptions.

You may be contacted and questioned, in the hope that you will give them some information to either incriminate you or others. Depending on LE and how they read you, that could be very friendly or they could try to badger you. The correct response is to plead complete ignorance, and if they push further tell them you want a lawyer present. In most cases they will not contact you, but if they do refusing to say anything and asking for a lawyer usually will put an end to any discussions.

They could try to publicly embarrass you, or threaten to do so. Even if the charges are very unlikely to stick, they could use her records or word to charge you, which then allows them to release your name and a nice mug shot to the papers. That may get picked up, but when they drop the charges a few days later, that will not get picked up anywhere. Then it lives on the web forever that you were busted. This is unusual, but it can happen.

I think that is most of the bad news. The good news is simple - very unlikely you will get busted with any charges that stick unless you tell them something to help them out. And, unless you are famous or the case seems to lead somewhere they really want to go, it is very, very unlikely they will chase you at all. Probably a little more likely if you are in a smaller town, and a lot more likely if there is the slightest whiff of underage or trafficking in the case. But generally, they have only so many hours in the day, and their goal is to get convictions, not waste time screwing around with guys who are of no use and cannot be convicted.

That is my view of how it works.

zig

As with most legal issues, the real answer is "it depends . . ."

On a number of different factors, the primary ones of which the two previous posters outlined rather eloquently.  The most likely concerns would be the one noted of public humiliation by disseminating names found or having attention drawn to you so as to be the focus of further investigation.  I can't see the latter happening in any big city, they usually focus on the known girls and set up undercover females for john stings.  And even if you were later popped on a different case, unless the previous records were crystal clear as to purporting to establish a common scheme or purpose (which is highly unlikely for the reasons you note), there would be number of strong legal arguments that would most likely exclude the information from being used in a subsequent prosecution.

Distinguish between warrantless arrests and arrests with a warrant.      

     All LE needs is for the lady to say "I had sex for pay with A, B, C, & D" and LE can obtain a warrant for their arrest even though the crime take place in private.  Some states like Texas even have statutes that require one party to a sex for pay transaction to give evidence as to the transaction, although the evidence may not be used against the speaking party. But a lady facing a third strike charge in states making the third arrest a felony may be wiling to flip in exchange for immunity.

     So the risk is there if LE wants to come after the clients. But fortunately there seems to be is little interest in doing so if no other crime is involved. In the Desert Divas, for example, they only indicted clients who traded reviews for sex or discounts.

       If the lady does not flip and LE does not observe the crime in its presence, most states forbid a warrantless arrest and LE would have to get a warrant after building a case using circumstantial evidence. Again, too expensive for a mere misdemeanor arrest so you rarely hear of this happening, unless they want you for another reason.