Dakota Johnson used a butt double

 Dakota Johnson used a butt double

Dakota Johnson (Anastasia Steele) used a butt double during the film, but it is not known exactly in which scenes it is the real one and in which her double.

A secret that also involves the actress is that in the first installment of the film, the image of the actress's pubic hair is not real: they added pubic hair digitally.

It was also revealed that before the s-x scenes in the film, the actress did a sports warm-up, in which she mainly performed pushup routines to relax.