Heteronormativity is the belief that people fall into distinct and complementary genders (man and woman) with natural roles in life. It assumes that heterosexuality is the only sexual orientation or only norm, and states that sexual and marital relations are most (or only) fitting between people of opposite sexes. Consequently, a "heteronormative" view is one that 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.
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. Originally conceived to describe the norms against which non-heterosexuals struggle, "heteronormativity" quickly became incorporated into both the gender and the transgender debate.
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".