When opinions in a society change toward more or less tolerance of a group people do not necessarily see it. Drawing on a quasi-representative survey (Study 1, N = 830) and a natural experiment (Study 2, N = 437), we investigated people’s perceptions of the societal norms toward sexual minorities and the influence of laws on these (mis-)perceptions. Study 1 indicated pluralistic ignorance as participants overestimated the societal disapproval toward same-sex issues. Complementing this finding, Study 2 found that informing participants about a new law legalizing step-child adoption decreased perceived societal disapproval of same-sex parenting compared to participants not informed about the law. Pluralistic ignorance, however, was not affected by the new law. While results indicate that pluralistic ignorance may be more resilient to change, they also highlight that laws can have a dual impact on societies, changing not only the legal situation, but also shifting perceptions of societal norms.