Since the birth of their son, Jim and Michelle's sex life has deteriorated.Oz is an NFL sportscaster living in Los Angeles with his supermodel girlfriend Mia (Katrina Bowden).Kevin confronts Vicky about the night before, but she insists there was no sex. A newly sympathetic Heather comforts Oz, and they reconcile.
Jim encounters his neighbor Kara (Ali Cobrin), whom he used to babysit and who is soon to turn 18.
The guys have an altercation with Kara's boyfriend, A.
J., (Chuck Hittinger) and his friends, which ends with Stifler defecating in their beer cooler and destroying their jet skis.
The boys apologize to Stifler at his place of work, and insist that he is their friend saying "he is their asshole"; without him, high school would not have been any fun.
Stifler is uplifted by this and quits his job - but not before standing up to his antagonizing boss, Duraiswamy - and attends the reunion. Finch makes amends with Selena for lying, and they have sex in the bathroom - but not before a premonition of something vague but bad happening, which is that Stifler is having sex with his mother, as revenge on him for having sex with Stifler's mother.