She said: "I'm not going to ever watch them. I have literally zero interest. I can never say I regret it because that would just finish me off. [But] with the benefit of hindsight would I go through it again? Of course I wouldn't. I'd be mad."
Taylor-Johnson's decision to take on the project came as a surprise but she says she was drawn to the "dysfunctional fairy tale".
She explained: "It felt like a very dysfunctional fairy tale: a controlling prince and an unsuspecting young village girl. What I wanted to achieve is [for her] to usurp him against the odds."
And opening up about one of the movie's most controversial scenes, in which Dakota Johnson's Anastasia Steele is "punished" with six lashes from Christian Grey (Jamie Dornan), Taylor-Johnson insisted that it was necessary for character development.
She said: "The idea was she would hold a mirror to his darkness and come out with the power.
"It was a struggle and there were lots of onset tête-à-têtes, with me trying to bat it into the [right] place."
- Bang! Showbiz