We tested hypotheses drawn from three theoretical perspectives-gender belief system, authoritarianism, and social dominance-concerning hetero sexuals' attitudes toward lesbians and gay men. Data from 122 male and 131 female heterosexual college students with mostly White, middle-class backgrounds indicated that constructs postulated by all three perspectives played important roles in predicting attitudes: Gender differences in attitudes toward lesbians and gay men were mediated by social dominance orientation and gender role beliefs, indicating that gender role beliefs may act as legitimizing myths to justify antigay attitudes. Authoritarianism had both a direct relationship to attitudes toward lesbians and gay men and an indirect relationship mediated by gender-role beliefs.