Crash (David Cronenberg, 1996)
Based on J.G. Ballard's novel, which I haven't read, David Cronenberg's Crash depicts the changes in the lives of cinematographer James Ballard (James Spader) and his wife Catherine (Deborah Kara Unger), an open minded couple with no boundaries on fidelity. The film opens with each having sex with another partner and shortly after telling each other their experience. If this seems twisted you haven't seen the rest of the film yet.
