Queer theory:

In Queer Theory: An Introduction, Annamarie Jagose provides a clear and concise explanation of queer theory, tracing it as part of an intriguing history of same-sex love over the last century, from mid-century homophile movements to gay liberation, the women's movement and lesbian feminism, to the re-appropriation of the term "queer". Carefully interrogating the arguments of supporters and opponents of queer theory, Jagose suggests that its strength lies in its questioning of the very idea of sexual identities. Blending insights from prominent queer theorists such as Judith Butler and David Halperin, Jagose argues that queer theory's challenge is to create new ways of thinking, not only about fixed sexual identities such as heterosexual and homosexual, but also about other supposedly essential notions such as "sexuality" and "gender" and even "man" and "woman".