Conan O’Brien was asking Jamie Dornan how much the directors during the three movies intervened and gave opinion while filming the sex scenes, and Dornan admitted he learned more from Dakota Johnson than the other directors.
And to the point where Dornan later felt comfortable talking about this story on the late night program Conan.
Although Jamie Dornan is married to Amelia Warner and Dakota Johnson has dated multiple people since starring in Fifty Shades of Grey, they seem pretty friendly on the set together, to the point where Johnson apparently felt comfortable telling him he was terrible at ripping panties off.
This may explain how the chemistry in the sex scenes ended up working out so well.