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LOS ANGELES— A trailer for “The Hangover Part II,” which features a monkey performing a simulated sex act, has been pulled from theaters.

The ad was not properly vetted by the Motion Picture Assn. of America, which makes sure movie advertising isn’t out of sync with the ratings system, and the group has asked distributor Warner Bros. to rectify the situation.

“In our haste to meet the placement schedule for this trailer, we failed to properly vet the final version with the MPAA. We acted immediately to correct the mistake and removed the trailer from screens,” Warner Bros. said in a statement.

The studio would not discuss what was being tweaked, but insiders said a scene featuring a monkey sucking on a bottle placed under an old man’s sarong was a likely target.

The trailer debuted in front of “Source Code” last Friday. The revised version will debut on April 15, in front of “Scream 4,” which carries the same restrictive “R” rating as Hangover.” The film opens in theaters on May 26.