Plot
Sam and Grace meet in a movie theatre, both having gone to the Swedish film alone. Afterwards, they contemplate having sex in a cheap motel. Eventually they get fastfood and beer, taking it to the room, but instead spend the evening walking and talking.
Howard and Monica are in a hotel, having been having an affair for four months, as he is married to someone else. He wants to end it, so she gives him thinly veiled threats, but he leaves nonetheless.
Michelle and Allen are attending a wedding, where he intercepts the bouquet so she cannot catch it, although she had fantasized it being the idyllic start to their perfect future together. Back at his apartment Michelle changes clothes, gives Allen a 24-hour ultimatum, and walks out.
Howard goes into a coffee shop after leaving Monica, where he and a waitress observe a young couple, causing him to miss his youth. Monica points out to a young female hotel clerk while leaving how quickly people age.
Going home, Howard finds his wife Grace in the living room. After an awkward conversation, their daughter Michelle comes in. She brings up the ultimatum she dropped on Allen, which her mother fully supports. Allen similarly tells his parents Sam and Monica, and his dad is in favor of a wedding while Monica isn't.
The next morning, the religious Grace is watching a sermon on TV about infidelity and admitting guilt and talks back to it. When Howard overhears, he sneaks out of the kitchen.
The two sets of parents continue talking to their respective children about marriage. Both of Michelle's talk about the importance of wedding rings, symbolizing commitment; the irony is both are hiding betrayal and guilt and neither is wearing theirs. Howard and Grace are surprised that the sets of parents have never met, so they get Michelle to invite Allen and his parents to dinner. Sam accepts although Monica isn't enthusiastic.
When Allen and his parents arrive, there is extreme awkwardness, although the double affairs are still secret. Monica goes with Howard to get the drinks, and continues to threaten him. Grace walks outside under the guise of showing Sam the house grounds and he tries to convince her that they had a strong connection, that it was fate, and that they need to pursue a relationship. She wants to fight for her marriage.
Michelle and Allen continue talking the pros and cons of getting married. The conversation ends with her concluding that his negative view of marriage is based on his parents’ failing relationship.
In front of all four parents, Michelle asks Allen to trust in the now and not fear that things could end badly, to take a leap of faith with her. She leaves the room, and he soon follows after encouragement from both fathers. Left alone, Monica starts to reveal her affair with Howard. However, Grace and Sam guiltily confess about meeting the previous night, and Monica smugly talks about her affair with Howard, who then begs Grace for forgiveness.
Upset, Grace goes outside, while Sam and Howard compare info about their infidelities. Howard explains that theirs was purely physical whereas Sam explains theirs was purely cerebral. They start to fistfight, but soon are hugging. Howard considers both his wife and Sam are better people than him. Monica follows Grace and tells Howard was never that lost and that their marriage could still be saved.
The men join them outside. Howard said it was the last and only time he cheated on her, which Monica corroborates. Grace is hurt that he had sought solace in another's arms, rather than talking with her. When she leaves in tears, Sam encourages Howard to go after her as she believes her best possible happy ending is with him.
Sam and Monica start talking once they are alone. He had always felt she is more interesting than him, that she is an unstoppable force, and he has stayed because of their son. Meeting Grace, he now sees he could love again.
Michelle and Allen write their own vows and marry. Afterwards we see Sam and Monica part ways, while Howard and Grace have rediscovered their passion for each other.
