The producer - who created the trailer's soundtrack - chose to rework the singer's hi-tempo anthem into a slower, more sultry tune and says it was the best choice for the S&M movie.
''It just fits. I like to think of myself as more than just a producer. I look at what we did for the trailer and this version of the song is, very much in my opinion, a score.
''It was something that I consciously scored. Whenever it comes to the stuff that Bey and I do, I'll never speak for her, but I think that she killed it. She just absolutely killed it. The acapellas that she did gives me chills, so it's really dope.''
Boots also believes Beyonce's song is the perfect accompaniment to the raunchy movie which tells the story of how virginal Anastasia Steele falls for bondage-loving billionaire Christian Grey.
He added: ''I think falling in love can make you do crazy s**t. That was the spirit of the original song in the first place, we flipped it and it kind of became a whole thing. This is the first time I've ever worked on a trailer."