Most marital relationships are, I'd warrant, conditional, but not on Planet Swinton, which is a pure and rarefied place. She is, somehow, incorruptible, and this quality means she manages to get away with so much, personally and professionally. She has just launched her own perfume, which for other stars is the beginning of the sell-out, but she makes it work. The scent, a suitably blazing blend of ginger and immortelle, is made by the 'wonderful' cult Parisian parfumier Etat Libre d'Orange and is called Like This, after her favourite poem by Rumi, the Sufi poet of love. 'If anyone asks you how the perfect satisfaction of all our sexual wanting will look, lift your face and say, "Like this."' The poem is printed on a slip inside the perfume's packaging. 'I hope people will take it out and pin it to their glass,' she says, using the old-fashioned posh word for mirror.