XX/XY (2003)

A guy (Coles) and a girl (Sam) meet uncute in college and immediately strike up a sexual relationship. Their first try includes the girl's best friend (Thea) -- a menage a trois that stalls when Sam chickens out or feels dirty...or whatever. The couple should've taken the hint that, as long as there's extra people in the relationship, it's not gonna work. Instead they plod along uninterestingly together and finally have an ugly break-up right after Coles decides to screw Thea -- continuing the deed even after Sam walks in on them and holds Coles gaze for a few seconds.

Fast forward several years: Coles is in a long-term relationship, Sam has just broken off an engagement, and Thea's married to a successful restaurateur. But when Coles and Sam run into each other on the street, things start back up between them. Yawn.

The second act is about 300% more tolerable than the first, but since I disliked the first quite passionately, that's not saying much. If any of the characters had any redeeming qualities, this might have been more interesting. I certainly don't know that for sure, but it's an idea.

D+