This article investigates how changes in same-sex rights affect attitudes toward homosexuality. We argue that different same-sex relationship policies vary in their impact. Whereas registered partnership laws construct a distinct target population that receives new benefits, marriage equality sends an unambiguously positive signal and reduces the perceived group difference through inclusion into existing rights. As a consequence, marriage equality should have a positive effect on attitudes toward homosexuality, whereas partnership laws should have much less positive effects and could even lead to backlash among some groups. Combining data from eight waves of the European Social Survey with data on legislation, we analyze the effects of same-sex marriage, registered partnerships, and marriage bans on attitudes toward gays and lesbians. Marriage has a positive effect, bans and registered partnerships have a negative effect. Legalized partnership is especially associated with significantly more negative attitudes among nonreligious and less educated people.