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Matt Bomer
For: Bomer has been the frontrunner for the role ever since the movie was announced, with fans going so far as to create a petition to give him the part — even after Hunnam was cast. (Ouch!) From the description of Christian in the books, it's almost as if the character was written with Bomer in mind.
Against: Author Bret Easton Ellis drummed up some controversy last year when he tweeted that Bomer is "not right" for the role because in real life he's openly gay. While we find that absurd, Bomer seems less than enthusiastic about potentially taking on the part. Plus, if TPTB really wanted him, they probably would have cast him off the bat.