This investigation examines the differential power of explanation of a sexual conservatism theory of homophobia against a more general theory of intergroup prejudice. Forty-eight female and 31 male undergraduate introductory psychology students from a large Eastern university completed a survey assessing contemporary attitudes toward women, Blacks, and homosexuals, as well as their affective orientation towards sex. The results indicate that sexual conservatism, as measured by an affective dimension of erotophilia-erotophobia, and social prejudice, as measured by racist and sexist beliefs, are independent and equal predictors of antihomosexual sentiment. It is suggested that distinct etiological differences may exist in the development of the homophobic personality. Findings are discussed within the context of Herek's (1984) functional approach to understanding attitudes toward lesbians and gay men.