26-year-old Keira Knightly plays a young psychiatric patient named Sabina Spielrein in A Dangerous Method. In the film, the protagonist gets sexual thrill from being spanked.
Keira is quoted by the Sun newspaper as saying that once she was done with practising the various expressions she could have for the film, she would get on to Skype with David and show him all that she could do. He would then help her decide which expression suited best.
A Dangerous Method is based on the true life story of Sabina, who formed a sado-masochistic relationship with her famous psychiatrist Carl Jung.