Keira Knightley has never had a problem getting her kit off for films – but when it came to playing a sex-obsessed seductress, she needed a little Dutch courage.

Some of the sex scenes in A Dangerous Method were so explicit that 26-year-old Keira initially turned down the role and then had to swig vodka to get through them. And beer. And champagne.

Keira plays a masochistic, erotically charged mental patient who has an affair with her psychoanalyst Dr Carl Jung (played by Michael Fassbender).

At one point, she is tied to a bed, topless and spanked. No wonder, she says she and Michael necked booze to calm their nerves ahead of filming the raunchy scenes.