Jamie Dornan at a London Fashion week event last week.Irish Voice

The "Fifty Shades of Grey" novels leave zilch to the imagination when it comes to sex, but Jamie Dornan, the Northern Irish star of next year’s film based on the hit books, says those expecting hardcore porn will be disappointed.

"You've got to make something a large amount of people can go and see. It's not going to be grotesque,” Dornan told British GQ.

"I mean, in some ways, it'll break a few boundaries. But at the same time, they want to put bums on seats. They can't alienate an audience. You know it has to be watchable. It can't be hardcore. I wouldn't have signed up for it if it was."

We’ll get to find out when "Fifty Shades of Grey" opens on Valentine’s Day, with the super-hot Dornan playing the bondage obsessed Christian Grey.