The sketchy plot is founded on a dubious backstory. Christian, we are led to believe, acquired his disordered tastes from a combination of childhood physical abuse and the later tutelage of his adoptive mother Grace's (Marcia Gay Harden) friend, Elena Lincoln (Kim Basinger), whom Christian nicknames Mrs. Robinson. Koo-koo-ka-choo.

We will leave it to the professionals to explain how plausible it is that Christian has switched sides in the bondage game, going from taking punishment at Elena's hands to dishing it out to a succession of partners. Equally puzzling is the idea that being mistreated by a man early in life would inspire a mania for walloping women. But there it is.

As for Anastasia, presumably in order to keep things frisky, she occasionally takes a walk on the wild side. But the next minute, she's back to freaking out over Christian's 31-flavors approach to bedroom behavior.

To give the movie its due, the central duo does move toward acquiring outward respectability and lending permanence to their bond. So, if there's a moral to be drawn from Anastasia's saga, perhaps it's this: A smack on the butt may be quite continental, but diamonds are still a girl's best friend.

The film contains excessive sexual content, including aberrant acts, graphic activity and much nudity, several uses of profanity and occasional rough and crude language. The Catholic News Service classification is O -- morally offensive. The Motion Picture Association of America rating is R -- restricted. Under 17 requires accompanying parent or adult guardian.

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Mulderig is on the staff of Catholic News Service.

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CAPSULE REVIEW

"Fifty Shades Darker" (Universal)

Sordid sequel in which a sadist billionaire (Jamie Dornan), yearning to revive his relationship with a book editor (Dakota Johnson) who doesn't share his interest in dungeon doings, struggles to control his urges. Whether Mr. Kinky Boots can kick the habit is one of the least compelling questions imaginable and the nonsexual scenes with which director James Foley pads out his adaptation of E.L. James' novel range from the boring to the ridiculous. So anyone with a higher interest than mere prurience will be disappointed. Excessive sexual content, including aberrant acts, graphic activity and much nudity, several uses of profanity, occasional rough and crude language. The Catholic News Service classification is O -- morally offensive. The Motion Picture Association of America rating is R -- restricted. Under 17 requires accompanying parent or adult guardian.

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CLASSIFICATION

"Fifty Shades Darker" (Universal) -- Catholic News Service classification is O -- morally offensive. The Motion Picture Association of America rating is R -- restricted. Under 17 requires accompanying parent or adult guardian.