Carly Whitten (Cameron Diaz), a New York attorney, has started a relationship with Mark King (Nikolaj Coster-Waldau), a man she's been having sex with for eight weeks. Carly, planning to introduce Mark to her father, Frank (Don Johnson), is upset that Mark has to go out of town on account of a flood at his Connecticut home, missing their dinner. However, she decides to go to his house to seduce him instead. She is horrified to meet Mark's wife, Kate (Leslie Mann), whom she'd originally assumed to be Mark's housekeeper. While initially hostile, both of the women befriend each other. Kate then discovers that he is still seeing another woman, who she thinks is Carly secretly continuing her previous relationship with Mark. After another fight, they discover together that Mark is seeing a third woman.