Charlie goes to his estranged sisters baby shower with Kate and the group is all convinced that Ed's daughter is a lesbian.
Charlie is worried that his dad has Alzheimer's and Nolan has a breakthrough.
Charlie wants to date a former patient after the 5 year mandatory waiting period only to discover that he isn't the only one of her therapists with that idea.
Charlie’s dad turns out to be a bad influence on his new friends and Lacey helps Patrick with a bully from school.
Kate starts to become jealous when Jen moves in with Charlie for a few days.
Charlie decides to trick Ed with a placebo pill to help him with his anger issues.
Charlie dates his daughter's teacher.
Charlie runs into problems when Cee Lo Green hires him as his personal therapist.
Charlie and Kate face off as opposing expert witnesses in a trial and Charlie tries to help Nolan get in touch with his feelings.
Charlie doesn't want Sam to be baptized and gets furious with Martin when he takes her to get it done behind Charlie's back.
Charlie falls back into a relationship with his crazy ex Lori and Jen and Kate have a girls night out.
Lindsey Lohan hires Charlie to be her anger management therapist on a commercial but he ends up getting her in trouble.
Lacey gets into a fight with one of Charlie's neighbors and he ends up only making it worse.
When Sam finds out that her favorite horse is in equine therapy, Charlie uses that as a bonding exercise for his group.
Charlie unknowingly pushes two of his group patients together in a romantic relationship.
Charlie gets jealous when he finds out that she is sending dirty pictures to someone, and uses Nolan to spy on her.
Charlie and his father coach a high school baseball team together which had very bad results.
Jennifer becomes Patrick's life coach and Sam helps Martin set up a facebook account.
Martin tries to come between Charlie and Kate by telling her that he is back together with Jennifer.
Charlie and Kate end their relationship and Jen's ex-boyfriend, Sean returns.
After their breakup Charlie sees a new therapist to deal with his anger towards Kate, and the group plays a trick on Ed that backfires.
Charlie and Kate try to control their sexual urges as they begin work together on their sex study. And Lacey gets a new job.
Charlie discovers a shocking secret from Sean's past and Ed moves in with Nolan.
Charlie gets himself a new friends with benefits....but is that really all she wants? Also, Nolan and Patrick fight over a woman.
Charlie takes the group for a trip to Lake Tahoe but rushes home when he receives a text from Kate.
Charlie starts dating a hot nerd which angers her nerdy ex-boyfriend who decides to get back at Charlie.
Charlie picks up a woman at the prison, only to discover weeks later, that she is the sister of one of his prison group members.
Charlie suspects a love triangle between Lacey, Jen and her boyfriend Sean, also Nolan's apartment gets robbed
Ed moves in with Charlies dad, and Charlie ends up having to clean up the mess when they get into a car accident.
Charlie meets one of Kate's patients, who is a thirty-two-year-old virgin and when Kate talks to him about possibly using a sex surrogate to help her out, he mistakenly thinks she means him.
Charlie gets jealous of Jennifer's much younger boyfriend, Canvas and goes too far, with disastrous results
Charlie and Michael is held hostage by Charlie's prison group during a riot.
Charlie and Kate looses the grant for their sex study and comes up with a crazy idea to get new funding for the study.
Charlie tries to stop Kate from having sex with the executive in charge of funding their study.
Charlie recruits Sean to help him throw the biggest and most epic party of the century.
Charlie wants to hook up with the crazy hot grad student that's observing his group but she seems more interested in Molan. Meanwhile, Martin and Ed come up with a scam to make some extra money.
Charlie is forced to hire a new psychologist to replace Kate in his sex study. Meanwhile Jennifer and Lacey try to get back at Sean by playing a trick on him...but the trick is on them.
Charlie hooks up with Jordan's sexy AA sponsor who's also a recovering sex addict.
Charlie's group get a new member, a pimp who pays for Charlies services in an unorthodox way
Charlie gets a new patient who believes he's the devil.
When Charlie starts sleeping with Sean's ex-girlfriend, war breaks out between them.
Charlie suggests that Lacey and Patrick pretend to date in order for her to get her inheritance.
When Charlie finds out that the woman he lost his virginity to, thinks that it was really bad, he becomes determined to get a "do-over" at his first time.
Charlie is pursued by an attractive reporter who's doing a story on his sex study, but soon he and Jordan realises that something isn't right with her.
When Lacey gets caught breaking the law she persuades the judge to sentence her to house arrest at Charlie's house, much to Charlie's disdain.
Charlie makes Christmas plans with the group but then Sasha unexpectedly shows up with an offer too good to refuse. Meanwhile Sean is convinced that Jordan wants to hook up with him.
After another night of wild partying Charlie finds himself having to spend the night in jail, and the risk of having his license to practice suspended.
In an effort to help Wayne (and himself) out, Charlie persuades Jordan to pretend to be Wayne's fiancee in order to stop Wayne being transferred to a prison in Texas.
When Jordan's sexy twin sister comes to town, Charlie ends up sleeping with her.
When Charlie and Sean meet one of Patrick's old friends from back home, who also happens to be gorgeous, they bet which one of them will get her into bed first.
When one of Charlie's party buddies decides to give up the wild life and become a priest, Charlie tries to make him see what he will be missing out on.
When Charlie meets the daughter of his father's neighbor he finds it hard to resist her.
Charlie has a one-time fling with a sexy woman but finds himself in deep trouble when he realises who her father is.
Charlie hacks Jordan's online "date rate" account to give himself a great review in order to get a date with a hot woman.
Charlie gets an idea for a new clinic when Jordan destroys their sex study.
When Jordan gets fed up with Charlie's lack of work, she convinces his girlfriend to withhold sex.
When Jordan falls off the wagon and ends up making out with one of their prisoners, Charlie is furious with her.
Charlie spends the night with Lacey to keep her from killing her ex-boyfriend.
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 lets his house become a halfway house for five hookers.
Charlie tries to keep Lacey from hooking up with a dangerous ex-con.