Charlie is inspired to start a new clinic at the prison after Jordan wrecks their sex study.

Charlie sleeps with the girlfriend of a violent prisoner in his clinic, only to find out that the prisoner is being released the next day.

Charlie tries to stop Kate from having sex with the executive in charge of funding their study; Charlie's dad tries to stop Lacey from throwing herself at a sleazy yoga instructor.

When Charlie keeps choosing sex over work, Jordan convinces his girlfriend, Sasha, to cut him off for six months.

Charlie goes ballistic when a drunk Jordan makes out with a prisoner.

Charlie tries to keep Lacey from hooking up with a dangerous ex-con.

Charlie surprises his therapy group by bringing their dysfunctional parents to a session.

Charlie and Kate are ready to sleep with the right people to get funding for their sex study.

Charlie seeks his prison group's help when his partying ways result in him getting arrested.

Charlie wonders if his father is developing Alzheimer's.

Charlie goes too far when he gets jealous of Jennifer's much younger boyfriend, Canvas. Meanwhile, Patrick helps Lacey look sexy for her first modeling gig.

Charlie accepts a new patient, a pimp named Ray James II, into his therapy group. After Charlie sleeps with a young woman called Sasha (Anna Hutchison) who approached him at the bar, she reveals that she's a hooker and that Ray sent her as payment for his sessions. Meanwhile, Lacey, Nolan and Ed are creeped out by Ray, and attempt to hold their own self-help session without Charlie present.

Charlie asks for a second chance with the woman to whom he lost his virginity, and Lacey and Patrick try to keep up appearances when Lacey's parents pay a surprise visit.

When Charlie breaks it off with a police officer he's been dating, she abuses her power to make his life miserable. Meanwhile, Jordan struggles to establish a casual sex relationship with Sean.

Charlie dates Jennifer's business partner and finds out she has sexual anger issues.

Charlie is forced to hire a new psychologist to replace Kate in his sex study; Jennifer and Lacey trick Sean.

Charlie is pursued by a hot reporter who wants to experience his sex study.

Charlie almost destroys Ed's marriage; Jordan hits on Nolan.

A matchmaker sets up Charlie and Sean with the wrong dates.

Charlie blows up at his sister's baby shower.

Charlie's trip with the group is interrupted when he gets some interesting news from Kate. Also, Charlie's house is unwittingly used for a porno shoot.

Charlie and Kate face off as expert witnesses in the same trial.

Problems arise after Charlie has a threesome with his girlfriend and one of her friends, and Lacey uses Jordan's help to try and sell her eggs.

Charlie lets his house become a halfway house for five hookers.

Charlie and Jordan hire a hot tie-breaker to work as their associate on the prison clinic program.