Sam and Danny have daytime sex, which alarms Lizzie -- Sam's falling for her f**k buddy, a violation of one of the top ten rules. Kaylie dates her new f**k buddy and doesn't find it a problem; Sam wonders if she can pull off the same trick. Her co-worker, Kate, thinks casual sex is folly and tells Sam so, but when her boyfriend dumps Kate, Sam sees the wisdom of remaining uninvolved. Despite her good intentions, Sam accepts Danny's impromptu invitation to the movies and afterwards, to grab a bite to eat. She invites him back to her place, but he declines. Lizzie tells her she had it coming for breaking the rules. Then Danny calls and invites Sam for drinks. He tells her that he has to keep his dating life and his sex life separate, and breaks up with her. Sam drowns her sorrows in a pint of ice cream. The sounds of Kaylie and Jordan having energetic role-playing sex as "Trinity" and "Neo" drives her from her apartment and into the dive bar. Lizzie tells her that horniness is the price she must pay for breaking the f**k buddy rule. Lizzie and Tyler get so hot thinking about Trinity and Neo that they rush out to a fetish joint, leaving Sam alone yet again.