Heteronormativity is the belief that people fall into distinct and complementary genders (male and female) with natural roles in life. It assumes that heterosexuality is the only sexual orientation or only norm, and that sexual and marital relations are most (or only) fitting between people of opposite sexes. A "heteronormative" view therefore involves alignment of biological sex, sexuality, gender identity and gender roles. Heteronormativity is often linked to heterosexism and homophobia.
Michael Warner popularized the term in 1991, in one of the first major works of queer theory. The concept's roots are in Gayle Rubin's notion of the "sex/gender system" and Adrienne Rich's notion of compulsory heterosexuality. From the outset, theories of heteronormativity included a critical look at gender; Warner wrote that "every person who comes to a queer self-understanding knows in one way or another that her stigmatization is intricated with gender. [...] Being queer[...] means being able, more or less articulately, to challenge the common understanding of what gender difference means."
In a series of articles, Samuel A. Chambers calls for an understanding of heteronormativity as a concept that reveals the expectations, demands, and constraints produced when heterosexuality is taken as normative within a society.
Critics of heteronormative attitudes, such as Cathy J. Cohen, Michael Warner, and Lauren Berlant, argue that they are oppressive, stigmatizing, marginalizing of perceived deviant forms of sexuality and gender, and make self-expression more difficult when that expression does not conform to the norm. Heteronormativity describes how social institutions and policies reinforce the presumption that people are heterosexual and that gender and sex are natural binaries. Heteronormative culture "privileges heterosexuality as normal and natural" and fosters a climate where LGBT individuals are discriminated against in marriage, tax codes, and employment. Following Berlant and Warner, Laurie and Stark also argue that the domestic "intimate sphere" becomes "the unquestioned non-‐place that anchors heteronormative public discourses, especially those concerning marriage and adoption rights".