Swinging Sienna Miller

Oct 6, 2006, 12:56 GMT

Sienna Miller thinks monogamy is overrated.

The 'Casanova' star - whose boyfriend Jude Law had an affair with his children's nanny last year - thinks it is unrealistic for humans to stay faithful to just one person because sex is just an animal instinct.

Sienna told Rolling Stone magazine: "Monogamy is a weird thing to me. It's overrated because, let's face it, we're all f***ing animals. The fact is, no one is perfect."

The actress got her liberal view on monogamy from her hippy parents.

She explained: "They were really liberal in the early years.

"Our house was always full of artists and musicians and I knew from the start my parents were naughty and did things that other people's parents didn't."

Sienna, 24 - who stars as Edie Sedgwick in new Andy Warhol movie 'The Factory Girl' - has also spoken out about forgiving cheating Jude, 33, for his infidelity.

Speaking at a Pepe Jeans party in London, which the couple attended together on Wednesday night (06.10.06), she said: "The only thing I know is that Jude is just my dear friend.

"I care about him. Our relationship has been though very difficult times and there's something inside me I don't like about it now. There are thing that will never be the same."

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