The upcoming adaptation of "50 Shades of Grey" still hasn't found its Grey. According to Us Weekly, "Tron Legacy" star Garrett Hedlund turned down the chance to play Christian Grey in the film because he didn't want to commit to the eventual sequels, "Fifty Shades Darker" and "Fifty Shades Freed."

The novels, by E L James, are of the erotic fiction variety. Hedlund's representatives did not wish to comment on the Us Weekly report when reached by HuffPost Entertainment.

Casting for the "Fifty Shades of Grey" adaption should begin to heat up soon: Universal Pictures and Focus Features set Aug. 1, 2014 as the project's release date. Sam Taylor-Johnson was hired to direct the film back in June.

"She's creative, incredibly talented, she's got an extraordinary eye," James told Vulture during Comic-Con last weekend. "She had a good idea about the whole Fifty experience, she understands it. And I thought, 'There's a woman I can go and get drunk with.'"

Hedlund apparently isn't too eager to wield a riding crop on-screen. The hunky "Tron" star has reportedly declined the juicy role because of the overall commitment expected of him

"Doing a possible trilogy was too big a commitment, and producers wouldn't let him do just one film," a source close to the actor allegedly told Us Weekly.

Garrett Hedlund didn't want to commit to three movies in the 50 Shades trilogy

The sultry novel follows a 21-year-old virgin named Anastasia Steele, who interviews a gorgeous 27-year-old billionaire for her college's literary magazine only to find herself being pursued by him.

He eventually proposes that she become his sexual submissive, even presenting her with a contract of what they can and can't do in the bedroom. As it turns out, Christian is into BDSM and likes to spank, whip, and tie up his conquests.

Despite it's ridiculous premise and Anastasia's eye-rolling inner monologue about her inner-goddess, the series has sold a whopping 70 million copies.