Your Friends and Neighbors (1998)

This adult comedy follows six characters, three men and three women from a cross-section of social groups, as they play sexual power games. When an affair fires up between 2 of the married characters, it sparks a chain of consequences for all of them, including one of the wives falling for another woman!
Neil LaBute, Todd Y. Murata, Albert Cho
Amy Brenneman, Aaron Eckhart, Ben Stiller, Nastassja Kinski, Jason Patric, Catherine Keener, Lola Glaudini
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