Someone said :
Went to one of 'em years ago. Not the cinema, just the viewing booths in the sex shops.
Plenty of tissue there as well.
There was one where when in the booth it was pitch black, couldn't see the tv to turn it on. Eventually did though. Small booth, pitch black, looked like a web cam fibre optic thingy behind me in the wall.
Needless to say I was a bit paranoid and didn't pull my knob out for a bit of a rub.
Bring a torch and examine the room next time. Bring some black spray paint for any suspicious lens or camera type apperatus.