Heterosexuality

Heterosexuality consists of sexual behavior, practices, and identity predicated on a primary preference or desire for the opposite sex. As a sexual orientation, heterosexuality refers to "an enduring pattern of or disposition to experience sexual, affectional, physical or romantic attractions primarily to persons of the opposite sex"; it also refers to "an individual’s sense of personal and social identity based on those attractions, behaviors expressing them, and membership in a community of others who share them". The term is usually applied to human beings, but it is also observed in all mammals.