And, to go a step further, is the practise of fist-fucking not the exemplary case of what Deleuze called the "expansion of a concept"? The fist is put to a new use; the notion of penetration is expanded into the combination of the hand with sexual penetration, into the exploration of the inside of a body. No wonder Foucault, Deleuze's Other, practised fisting: is fist-fucking not the sexual invention of the twentieth century, the first model of postsexual eroticism and pleasure? It is no longer genitalised but focused just on the penetration of the surface, with the role of the phallus being taken over by the hand, the autonomous partial object par excellence. (Slavoj Zizek, Organs Without Bodies: On Deleuze and Consequences, 2004, p 184).