Keira Knightley has ''directorial'' control over her movie sex scenes.

The 34-year-old actress has said she has control over how her characters are depicted when it comes to nude and sex scenes in movies, as she says she's ''in a position'' where she can have the final say.

She said: ''I think I am in a position where I can be quite dictatorial about what I am comfortable with and what I am not. I am in a position where I can say yes and no.''

Keira says her usual movie contract is ''very clear'' about the kinds of work she's prepared to do, and the papers insists she has ''approval'' over the final edit if there's a sex scene in the flick.

Speaking to Whimn magazine, the 'Aftermath' actress said: ''I have a contract that is very clear about what I am prepared to do, and with sex scenes in particular I have approval over the final edit.''

The comments come as Keira recently said she wants to embrace the signs of ageing, but still panics when she finds a stray discoloured hair amongst her brunette locks.

She said: ''I walk down the street and I see women with amazing grey hair and the lines on their face and I think it's the story of their life and I love it and I feel empowered by it and that's what I want to be when I grow up.

''And then I find grey hairs and I think, 'Oh my god I'm going to dye it!' ''

The 'Atonement' star - who has daughter Edie, three, and is expecting her second child with husband James Righton - insisted she isn't entirely driven by ''vanity'', but the shock of no longer recognising who she sees in the mirror.

She added: ''You think you know what your body is and what your face is, then suddenly it changes.

''It's not about vanity, some of it is, but it's not all about vanity. It's about not recognising who you thought you were.''