2 meanings : 1. a person who is sexually, romantically, or emotionally attracted to members of the opposite sex 2. of or.... Click for more definitions. Heterosexuality is romantic attraction, sexual attraction, or sexual behavior between people of the opposite sex or gender. As a sexual orientation, heterosexuality is "an enduring pattern of emotional, romantic, and/or sexual attractions" to people of the opposite sex. It "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions." [1][2] Someone who is heterosexual is commonly referred to ... HETEROSEXUALITY definition : 1. the state of being heterosexual (= sexually or romantically attracted to men if you are a woman…. Learn more. HETEROSEXUAL meaning : 1. sexually or romantically attracted to men if you are a woman, and women if you are a man: 2…. Learn more.