Seeing Other People (2004)

Ed and Alice, a happy couple who are just months away from their wedding. After accidentally witnessing a friend having anonymous sex at her engagement party, Alice begins to feel inadequate about her own sexual history and she proposes to Ed that they have sex with other people until their wedding. Though Ed is initially against the idea, Alice is persistent and he relents thinking that she will never follow through with it. Of course, things don’t go smoothly and despite the rules they mutually lay down, Ed and Alice’s relationship is put to the test, and their friends and relatives can’t help but get involved when the arrangement begins to spiral out of control.