The actress went for the role of Anastasia Steele, which eventually ended up going to Dakota Johnson, but she was taken aback by the "sexually forward" monologue she was asked to read for the part.
Speaking to AP Entertainment, she said: "I was very young. I forget… it had to have been, not 10 years ago, it was a while ago and I was mortified.
"It wasn't actual scenes from the movie, but it was a very sexually forward monologue and I didn't really even know what I was saying in the audition."
She added: "I was a little naive about it all, but yes, I did audition. I obviously didn't get the part, but it was good for me because it scared the crap out of me to do an audition like that.
"[I] went to an actual sex convention – it was wild. Stuff I've never seen before. There were some things in the movie that I had never heard of or done. So, I did it to broaden my horizons."
Hale now stars in new movie A Nice Girl Like You, in which her character makes a sex to-do list after her ex-boyfriend accuses her of not being adventurous in bed.
A Nice Girl Like You is available to stream on Amazon Prime Video.
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