Many middle-aged mums rushed to get the 50 Shades of Grey book and made sure they watched the film following its release.

The movie put Dakota Johnson in the spotlight, thanks to her role as Anastasia Steele, a college graduate. She starred alongside Jamie Dornan, who took on the part of Christian Grey, an intense and alluring man.

Dakota's role made her incredibly famous and turned her into a massive success in the entertainment industry.

However, she opened up about the filming experience being a struggle. When she signed up to act in the series, she had a very different version of the show in her mind.

To begin with, she chose to get involved with "big naked movies" because she is a "sexual person."

Dakota told Vanity Fair that whenever she takes an interest in something, she wants to know as much as possible about it.

As she auditioned for the role of Steele, she read a monologue from the 1966 Ingmar Bergman classic, Persona, with the expectation that her role would be exceptional.

When they finally started making the film, Dakota realized that things were not as expected.

She noted that E.L. James, the author of 50 Shades of Grey, had a lot of creative control over the production.

He would demand that certain things had to happen, but there were some parts of the book that would not work in a film, such as the "cheesy" inner monologues.

So, for Dakota, the role was also a battle. She was initially supposed to star alongside Charlie Hunnam as Grey. They had to revise the script when Charlie dropped out of his role.

Playwright Patrick Marber revised the script.

At the time, Dakota was just 23 years old, which made things a little scary for her:

"It just became something crazy."

Some sections of Marber's script were saved by Sam Taylor-Johnson, one of the directors in the series.

They would do takes that they wanted to make as well as takes the book's author wanted to make.

Before they filmed the next day, Dakota would rewrite scenes with the old dialogue to add a line or two of her own:

"It was like mayhem all the time."

The scene about the sexual contract between Grey and Steele being drawn up was the only complete scene from Marber's script. According to Dakota, this was the best scene in the entire film.

Although she had constant "battles" while filming 50 Shades, she does not regret her involvement in the series.

Nevertheless, she has also admitted that she would not have accepted the role if she had known that things would have turned out as they did. As far as she is concerned, she would have found it "psychotic."

Still, she has no regrets about being part of the production.

In the end, Dakota said that 50 Shades was great for her career. Nevertheless, she still felt that the show was "So weird."