The most influential queer theorist is Judith Butler an American philosopher who draws heavily upon Foucault and Derrida. Butler’s chief contribution to queer Theory was to question the links between sex – the biological categories of male and female – gender- the behaviours and traits commonly associated with one sex or the other – and sexuality – the nature of sexual desire. Butler claims gender is wholly socially constructed, and developed her most well-known concept: gender performativity. She claims gender roles are taught and learned unwittingly through socialisation – as sets of actions, behaviours, manners, and expectations and people perform these roles accordingly.