“Fifty Shades of Grey” fans are on the fence about Charlie Hunnam and Dakota Johnson being cast but he essentially said their chemistry is undeniable at the “Sons of Anarchy” season 6 premiere at the Dolby Theatre Saturday, Us Weekly wrote. The 33-year-old dished about what he thought of his costar and how he got the role.

The star referred to the movie "a big commitment," since it’s based off the eroitica, which contains three books written by British author E.L James. Before accepting the role, he wanted to explore the character of Christian Grey more.

“We kind of both suggested I do a reading with Dakota, who was her favorite, and as soon as we got in the room and I started reading with Dakota I knew that I definitely wanted to do it," he said of the audition. "There's just like a tangible chemistry between us. It felt exciting and fun and weird and compelling."

"I met with [director] Sam Taylor-Johnson a couple of times. She'd asked to meet me and we talked at length about the role, the movie and what her intention was," he said. "I felt really intrigued and excited about it so I went and read the first book to get a clearer idea of who this character was, and I felt even more excited at the prospect of bringing him to life."

As far as his girlfriend Morgana McNelis is concerned, Hunnam portraying the 27-year-old Seattle billionaire could just be a chance for them to become closer. "I didn't tell her the news, she was a part of the decision-making process," Hunnam said.

"It's very hard to be with an actor. She's required to share parts of me that she wouldn't really want to share so of course with the nature of this role that's going to be times ten. So it was a decision we made together but you know, she loved the books, she read them and loved them and she was really excited at the potential of this opportunity for me and if anything I think it will bring us closer."

Hunnam and Johnson have been chosen to star in the film adaptation of the book that broke barriers and brought S&M into the homes of millions of people. The movie is set to debut on Aug. 1, 2014 and the official trailer is rumored to air during the Super Bowl.