A sorority moves in next door to the home of Mac and Kelly Radner who have a young child. The Radner's enlist their former nemeses from the fraternity to help battle the raucous sisters.
Shelley is living a carefree life until a rival gets her tossed out of the Playboy Mansion. With nowhere to go, fate delivers her to the sorority girls from Zeta Alpha Zeta. Unless they can sign a new pledge class, the seven socially clueless women will lose their house to the scheming girls of Phi Iota Mu. In order to accomplish their goal, they need Shelley to teach them the ways of makeup and men; at the same time, Shelley needs some of what the Zetas have - a sense of individuality. The combination leads all the girls to learn how to stop pretending and start being themselves.
A veteran high school teacher befriends a younger art teacher, who is having an affair with one of her 15-year-old students. However, her intentions with this new "friend" also go well beyond platonic friendship.
Longtime friends Ronny and Nick are partners in an auto-design firm. They are hard at work on a presentation for a dream project that would really launch their company. Then Ronny spots Nick's wife out with another man, and in the process of investigating the possible affair, he learns that Nick has a few secrets of his own. As the presentation nears, Ronny agonizes over what might happen if the truth gets out.
19-year old Belle practices playing the violin diligently, but is unable to impart her music with a sensitive undertone. Her life changes when she discovers that sexual desire stimulates passion in her music.
Erik, Ryan, and Cooze start college and pledge the Beta House fraternity, presided over by none other than legendary Dwight Stifler. But chaos ensues when a fraternity of geeks threatens to stop the debauchery and the Betas have to make a stand for their right to party.
Irresponsible party girl, Maggie is kicked out of her father's and stepmother's home—where she lives for free—and is taken in by her hard-working sister, Philadelphia lawyer, Rose. After Maggie's disruptive ways ruin her sister's love life, Rose turns her out as well. But when their grandmother, who they never knew existed, comes into their lives, the sisters face some complicated truths about themselves and their family.
A young Parisian woman begins a sordid affair with a middle-aged American businessman who lays out ground rules that their clandestine relationship will be based only on sex.