Dakota Johnson is too embarrassed to talk to her parents about her 'Fifty Shades of Grey' role.

The 24-year-old actress is currently filming the big screen adaptation of E.L. James' erotic novel opposite Irish hunk Jamie Dornan, but admits she hasn't ever discussed the intricacies of her role as naïve Anastasia Steele - who gets entangled in an S&M relationship with kinky businessman Christian Grey - with her family.

Dakota - who will have to strip off naked for the part and engaged in very explicit scenes - blushed: ''I think that I would love to have [my parents] experience it with me, but I can't really do that, just because of what it entails. I talk to them more about problems with my landlords. That's my talking point with my family.''

The book trilogy has been dubbed ''mommy porn'' by the media due to its popularity with middle-aged women.

Dakota will be happy if the majority of the audience who see the movie - which also stars Rita Ora, Eloise Mumford and Luke Grimes - but she is anticipating a varied crowd.

She told the latest issue of Vanity Fair magazine: ''I wonder if it will be like, 40 year old moms, which I am cool with. I love moms.''