Fifty Shades of Grey star Jamie Dornan said filming racy scenes for the film with co-star Dakota Johnson was "not sexy".
The Northern Irish actor appears as billionaire Christian Grey in the big screen adaptation of EL James' erotic novel while Johnson plays Anastasia Steele - the college student he seduces, and introduces to the world of sadomasochism.
Dornan told The Observer Magazine of scenes in which he had to spank his co-star: "Anyone who thinks actors get turned on doing sex scenes in films is mistaken.
"There are dozens of hairy men standing around, moving cables and lighting equipment. That's not sexy unless you're into being watched, which I'm not."
Asked if his wife was comfortable with the scenes, he said: "She understands that it is work. I don't think we will be watching it together too many times at home, though."
Fifty Shades - which has been directed by Nowhere Boy's Sam Taylor-Johnson - is released on February 14 next year.
Dornan also stars in BBC drama The Fall, which returns for its second series later this month.