Should fantasies remain just that:fantasy??

I remember asking my then gf what hers were and she would never tell because she was ashamed. I finally got out of her that she wanted to be tied up and screwed.

I set it up one night and she loved it - it was a complete release for her and since she has been telling me when they come to her - some acted on and some not.

Are any of these dark, twisted and shameful? No
She has had an incredible release in her sexualilty where as if she had not released her fantasies verbally, she would still be bottled up.