Heteronormativity is the concept that heterosexuality is the preferred or normal mode of sexual orientation. It assumes the gender binary (i.e., that there are only two distinct, opposite genders) and that sexual and marital relations are most fitting between people of opposite sex. A heteronormative view therefore involves alignment of biological sex, sexuality, gender identity and gender roles. Heteronormativity is often linked to heterosexism and homophobia. The effects of societal heteronormativity on lesbian, gay and bisexual individuals can be examined as heterosexual or "straight" privilege.