The 23-year-old star, Keira Knightley said she discusses her sex life with her mother, playwright Sharman Macdonald.

She added to Britain’s Glamour magazine: “Mum and I would always talk about sex. She’d come up to my room, have me roll her cigarettes and then tell me I’d have to have one with her.

“Mum’s a bit mental in a good way. She’s this chilled-out hippy mother. My house was always the one where my brother and his mates would be drinking when they shouldn’t be.”