Not only piss play, but I did let my regular escort know I was into drinking piss and last time he had me on my knees, head back, and mouth open, as he pissed a bladder's load of piss down my throat. Fucking hot, and an excellent way to start two hours of cocksucking, fucking, and getting restrained, paddled, and flogged. I was hoping for more piss at the end, but I was a cummy mess and totally forgot. Him pissing down my throat out me in a properly subby mood for the rest of the play.
I wouldn't hire an escort for just piss play, as it would be hard to keep busy enough for some expensive time, but as part of a scene, sure, go for it. On rent.men it's commonly listed as something they'll do, so just ask.
This is something you should definitely arrange ahead of time to ensure a supply of piss, assuming you're into his piss. The other way around I've never done and it wouldn't interest me. I suspect it would be harder to find an escort into drinking piss, if that's what you had in mind. Just getting his body pissed on on the shower would likely go over better.