It's Complicated Rating Extremely Complicated - Hit & Run : Reason Magazine:
""What did you do in the drug war, Daddy?"
"I rated movies for inappropriate contact, son."
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.
Among movies featuring drug use that got PG ratings? 9 to 5 and Annie Hall. But they were released a long time ago, in a country far, far, away."