While he doesn't know exactly how many minutes of the movie are devoted to Christian Grey and Anastasia Steele (er, Anastasia Grey) getting it on, apparently there's more sex in the new movie than there is in Fifty Shades of Grey or Fifty Shades Darker.
Speaking on 'Jimmy Kimmel Live!' on Wednesday night (01.31.18), he said: "This is going to sound bad, but it's nearly like brother-sister. Because I am married and because she's had quite a lot of relationships in the time that we've known each other", he laughed. "You just have this sort of mutual love and respect for each other, and I feel like we know each other so well, and intimately".
The actor, 35, and his stunning wife somewhat co-ordinated in matching blazers and sunglasses, as they arrived at the show - where Jamie was discussing the final installment of the saucy film series, Fifty Shades Freed.
"They try to keep it a closed set. only whoever really needs to be there, like me", he jokes.
Jamie explained: "I was quite small and wasn't hairy at all - was 15 and looked seven. But it doesn't mean it's actually wee in size", he says.
"I wear this huge, like travel case".
Instead, the studio provides one for him, but it's not brand new. Grey while he's 'literally holding one of my children'. I was like, 'S**t.
"And I was like, 'Shit, this has been used before?' and when you picture the guy playing inmate number three in a movie in your head, it's not..." "Someone was telling me recently that there's more sex in the third one than the other two, but I don't know".