My wife and I once visited a porno theatre on a lark, but the movie was so lame we actually ended up watching other patrons masturbate, which turned out to be more interesting than watching the movie itself. I was both surprised and delighted, and more than a little curious, about the wife's obvious preoccupation with watching guys jack off. It seemed that some long suppressed voyeuristic urges were being released in that dark place.
The theatre contained mostly single males, and I noticed that the wife kept scanning the audience to see where everybody's hands were (mostly in their laps!). A few couples dotted the audience, and some of those couples were also obviously fondling each other (or staring back at my wife!). One couple was brazenly groping and casting glances in our direction, but at the time we were too shy to return these "gestures" -- although the wife did dare me to expose my cock, which I eventually did after much taunting from her.
She stroked it for awhile, and even went down on me briefly, but I found that I was much more courageous in fantasies than in reality, so I stuffed that horny toad back into my pants the first time a new patron walked down the isle near us to find a seat. Eventually, the wife became so excited by the lewd action she was witnessing that we left the theatre to go home and have some fun. In between licking, sucking, stroking and poking, she kept up a running monologue of nasty talk about what we had observed.