Oddly enough, this film seems to be about the safety and comfort of family On the surface, it's the story of Eddie Adams (Mike Wahlberg), a busboy in a nightclub in LA who, in 1977, gets recruited into the adult film industry by director Jack Horner (Burt Reynolds). He takes the stage name Dirk Diggler, and does very well until he gets hooked on cocaine in the 1980s, has a big falling out with Horner, and takes a run at being the prodigal son. Meanwhile, other members of Horner's tight little filmmaking group have their own personal disasters and problems dealing with the changing times.
On a deeper level, though, the film is about the safety and comfort of family. Each character finds a new definition of what family means by who accepts them for the flawed people they are, and who offers help when no one else does. From the safety of this acceptance, they feel they can achieve the things they want, despite most of the characters being terrible at actually navigating life and skills.
The people in this film are rejected by everyone else outside of their insular little world every time they try to interact with the wider world. So they eventually return to the only world they know, the only family that accepts them and is supportive - the adult filmmaking community, specifically the people making adult films for Jack Horner (Burt Reynolds). The exception might be Don Cheadle's character and his wife, and in their case, they've formed their own separate family, totally understanding the world that they both once inhabited.
Probably the coldness of the wider world is no better illustrated in this film than in the portrayal Joanna Gleason gives as Eddie's/Dirk's mother. Early on she freaks out on him one night, and in a rampage calls him stupid and a loser, while ripping the contents of his room to shreds. The way Eddie pleads "Please don't be mean to me", to the parent whom we are taught to believe is life's one guaranteed giver of unconditional love, explains Eddie for the remainder of the film. He'll do anything to be in good company regardless of cost.
The film has a terrific soundtrack and nails the period of the late 70s and early 80s completely. Burt Reynolds has said he never watched this film, didn't like making this film, and didn't like the director. That's odd since I found it to be Reynolds' best performance and one that got him nominated for a Best Supporting Actor Oscar.