According to the attribution-value model, prejudice toward a group stems from 2 inter-related variables: attributions of controllability and cultural value. Thus, prejudice toward gay men and lesbians may stem from others' holding them responsible for their behaviors and perceiving negative cultural value regarding homosexuality. The author tested that model by using the issue of homosexuality. The participants were Turkish undergraduates who completed a homophobia scale and answered questions about the origins of homosexuality, cultural attitudes toward homosexuality, and their own gender and sexual preferences. In general, the participants were prejudiced against gay men and lesbians. As expected, attributions of controllability and negative cultural value regarding homosexuality operated jointly to explain 39% of the variation in homophobia. The participants who thought that homosexuality was controllable had more negative attitudes toward gay men and lesbians than did those who thought that homosexuality was uncontrollable. The female participants were more tolerant of homosexuality than were the male participants.