The Classification and Rating Appeals Board has upheld the R rating given to 20th Century Fox’s romantic comedy “This Means War.”Fox recently appealed the rating, assigned for “some sexual content,” and the CARA board heard statements from the studio’s feature post production president Ted Gagliano. Successful appeals require that the group affirm a “clearly erroneous” rating by a two-thirds majority. News comes on the heels of Fox’s announcement that it would bump up “War” to Valentine’s Day. Studio moved the pic, which stars Chris Pine, Tom Hardy and Reese Witherspoon, to benefit from the holiday’s increased couples turnout. In the film, Pine and Hardy play best friend CIA operatives, who fall for the same woman (Witherspoon). “War” is directed McG, from a script by Timothy Dowling and Simon Kinberg. Romantic comedies often benefit from Valentine’s Day. Last year, Sony’s “Just Go With It” won the holiday box office, while Warner Bros.’s timely release “Valentine’s Day” broke records in 2010. Fox could not be reached for comment.