From the New York Times:
The romantic comedy “It’s Complicated” arrived at the multiplex on Friday complete with an R rating, ranking it in the same category as “The Texas Chainsaw Massacre” and “Basic Instinct” in the eyes of the Motion Picture Association of America.
But there is no violence in “It’s Complicated,” and the bedroom scenes are decidedly tame by contemporary standards. Instead, the R rating — which experts say could limit the box-office potential of the Universal Pictures film — comes largely from a sequence in which Steve Martin and Meryl Streep smoke marijuana.
The rating has kicked up dust in Hollywood, with movie bloggers starting blistering attacks on the M.P.A.A. for being out of touch. The marijuana lobby is equally miffed. “This is an absurd ruling rooted in old cultural thinking,” said Allen St. Pierre, executive director of the National Organization for the Reform of Marijuana Laws.