While its been described by some as “mummy porn” Fifty Shades of Grey actress Dakota Johnson has gone on to describe the EL James erotic novel as “an incredible love story.”

Dakota has been cast as Anastasia Steele in the screen adaptation of the novel, opposite Jamie Dornan who has replaced Charlie Hunnam for the role of Christian Grey.

The actress spoke about why she was so eager to land the role to Entertainment Weekly and said that she was in love with the story!

“I just really understand it,” Johnson said of the book. “I think it’s an incredible love story and that’s why it’s affected so many people.”

She then added: “[EL James] did a really good job of explaining how that just can happen sometimes and you have this chemical pull to someone.

“Adding in the sex makes it perfect. Sometimes you feel a little bit naughty and that’s okay.”

Following a lengthy audition process, Johnson also spoke about how blissfully happy she was when she got the call to tell her that she had landed the role.

“[When I got the call and] they said ‘You got the offer’ and I couldn’t speak,” she recalled. “I was just so relieved. I was crying and crying. Water was literally squirting out of my eyes because I had been so stressed out.

“And there’s this giant Doberman Pincher laying on the bed next to me. And he just slowly fell asleep. It was so special and [this dog] didn’t give a f**k about me and what I was going through,” she laughed.

Recent reports are also claiming that an explicit version of the movie could be released alongside the R-rated cut, which is slated for release on Valentine’s Day weekend in 2015.