Androphilia and gynephilia are terms in behavioral science (the study of human and animal behavior) that describe sexual orientation. It is an alternative to the gender binary in homosexual and heterosexual. Androphilia is attraction to a man or masculinity (any quality or behavior linked to a man). Gynephilia is attraction to a woman or femininity. Ambiphilia (bisexuality) is the combination of androphilia and gynephilia.