Following their disappointing seventeenth wedding anniversary, Cindy feels like the intimacy is lost between her and Jim and engages in an emotional affair with her old college boyfriend who has moved to town, scaring Brenda into thinking her parents are headed for divorce. Meanwhile, Brenda and Brandon participate in a UCLA study on twins. Also, David wants to be the new school DJ.

Things heat up between Brenda and Dylan and they soon start dating, causing differing opinions in the Walsh house. When sex becomes an option, Brenda learns that he may be too intense for her. Meanwhile, the gang begins Sex Education in Health Class and Scott has trouble getting his mother to sign the consent form. Steve attempts to hook up with Stacy Sloan, the class' speaker. Later on, everyone attends an AIDS seminar and listens to Stacy's speech based on her own experience and condition.