I was in one studio where I was (and continue to remain) convinced there was a camera in the room, poking its nosely little eye out from a hole cut in the ceiling tiles. I don't mind being recorded walking into and out of any establishment, though I agree that being recorded while in a room is a little disconcerting, but I can see how there could be a requirement for the cameras. I noticed the camera before the session and asked the SP about it (who denied its existence) and continued with the session. If she had of confirmed it was a camera, I would have still stayed for the session for hand-in-the-cookie-jar reasons, and for the service provided would have happily returned to the parlour.
I don't have any enormous aspirations in life, and as I understand, parlours are quasi-legal, so I don't care that I'm being recorded coming or going. If the cameras are there for the owners to ensure the staff aren't stiffing them on room fees, then a camera in the hall watching the rooms' entrances would suffice.
Personally, I'd be quite happy being told up-front that I am being recorded. Put a sign on the door that says, "Smile! You're on camera!" and people will behave. A person can then confront their SP about a camera being in the room or not. And ask for a video recording for an additional $20.
Since I don't have any proof beyond my own speculation as to the existence of the camera, I won't mention the parlour's name.
This is to ansewer all of your ? about your privacy while at pp the reason i'm posting this is the hindo owner vish didn't pay me for the installation of 6 cameras with time lap recorders yes you are recorded from the moment you walk up the stairs till you walk down they are disguiseed as motion detectors and yes the new pleasure point at 107ave and 102st has the same safety features not only that you take your life into your own hands getting into their unprotected showers and hottubs the owner does not think you are the extra $50. for a gfi breakers any ?s post and i will reply 
