People who argue against heteronormativity include Cathy J. Cohen, Michael Warner, and Lauren Berlant. They argue that it holds down those who do not fit it, marks them as outsiders, keeps them out of society, and makes it hard for them to express themselves. Heteronormative policies and institutions strengthen the belief that people are heterosexual and that there are only two genders and sexes by nature. They argue that heteronormative culture gives an unfair advantage to heterosexual people (this is called heterosexism). It causes members of society to keep LGBT people out of work, school, and the greater society, sometimes using the law.