It's not legal within city limits
They do tend to turn more of a blind eye to it than other US cities, but keep in mind, it's still nothing like Canada.
Your best bet is to go with a well reviewed independent companion. A number of the agencies upsell, and you never know what you are going to get.
I know they tend to go after the local ladies, and whomever they may be entertaining - however, I do know of a couple of
international escorts who got taken down and banned from the US. Keep in mind that this can happen to the gentleman too.