Fifty Shades Of Grey: Why Chuck Left

The specific behind-the-scenes details about the sudden exit of Sons of Anarchy and Pacific Rim star Charlie Hunnam from the film adaptation of the erotic E L James book "Fifty Shades of Grey" have emerged by way of THR.

What began as a posting on a fan-fiction website as a tribute to author Stephenie Meyer 's Twilight books soon became a word-of-mouth eBook hit that won a major reprint deal with Random House.

The sexually-explicit story follows 27-year-old billionaire Christian Grey and 22-year-old virgin college student Anastasia Steele (Dakota Johnson TV's Ben and Kate and The Social Network"), who develop a relationship steeped in bondage, S&M, domination and submission.

Hunnam, had previously passed on an offer to take the role before they came back to him. He felt uneasy about the frenzy (and fallout) surrounding his casting as Christian Grey. He put forth some "very detailed script notes" about Kelly Marcel's adapted script. They were well-received enough that  it led to Hunnam to ask script approval, which he ultimately didn't get.

Charlie was only gonna  earn around $125,000 from the movie - not a particularly large payout considering the high profile nature of the film (in comparison, a then unknown Robert Pattinson made $2 million for the first "Twilight").  When you consider both the media and personal scrutiny Hunnam was already under even before the film was shot--that is not a lot of cash

Hunnam has yet to speak on the matter-- also allegedly began clashing creatively with the director as well. This ultimately led to the exit...When you strip all of that away-it sounds like he wasn't comfortable doing the pic.

The search continues to find Hunam's replacement....