Keira Knightley drank vodka before spanking scenes

London: Actress Keira Knightley says she and her co-star Michael Fassbender downed vodka shots before shooting intimate spanking scenes for `A Dangerous Method`.

Knightley, 26, said they got through the most uncomfortable scenes by turning to alcohol, a website reported.

"We only had one or two shots maximum. It was a vodka shot to calm our nerves and way you go really. Then we had champagne. We drank quite a lot of champagne actually. You can count on Michael to buy a bottle of champagne when one is required. The vodka and champagne is a good combination," she said.

She also said that she now only chooses roles that challenge her and she loves to be frightened by her movies.

"I think all the work I have done over the past five years has looked for the thing that really frightens me – the thing that I really don`t know how to do. I think it is for selfish reasons."