Monogamy (2011)

I was on a long plane trip, one where it is entirely possible to watch six movies, and saw both this and 'Hall Pass'. In the later, two married men bombard their wives (who are quite attractive) that they are still actively gawking at women and thinking about what could be--to the point that their wives become fed up and give them a week where they can do whatever they want, sleep with whoever will have them. In that movie, they come to see that sex isn't as simple as all that.
In “Monogamy,” it is matter of watching what is essentially a sexworker having sex in public, and wondering why your sexual partner isn't up for that--all the time. The unrealistic expectations that can be born of too much porn. Why isn't your lover trying to jump your bones 24/7? Well, because she isn't being paid to pretend you are that hot.
Here's the story--Theo (Chris Messina), a wedding photographer, lives in Brooklyn with his girlfriend, Nat (Rashida Jones), and has carved out a somewhat unlikely side gig of sneaking shots of strangers for pay. Calling himself a Gumshoot, he takes photographs of paying strangers while hidden from their sight. The idea seems to be that clients will fork over dough to see what they look like in their everyday life.
This professional voyeur angle takes a turn for the kinky when a woman calling herself Subgirl (Meital Dohan) hires Theo to take photographs of her in a park. On the appointed morning he lies in wait with his camera while she shows up in tennis whites, oversize sunglasses and a bad blonde wig. Then the little lady sits on a bench, takes a few quick looks around and begins to openly masturbate--and then she is having sex in public places on a regular basis. Theo gets more and more wrapped up in it, preferring to watch pictures of Subgirl to spending any time with Nat, to not picking fights with Nat when she won't have sex with him in her hospital bed, to losing the relationship. We watch Theo unravel, we know what is happening and we are begging him to come to his senses. But he doesn't.
It reminds me of a 'Friends' episode where Joey and Chandler find out they have the porn channel and are watching it every spare moment, but when they are surprised when the pizza girl comes to the door and doesn't offer to sleep with them--not even offering up a blow job, that they come to their senses and realize they are watching too much porn. Theo never wakes up.