This paper introduces mixedness as a conceptual and analytical framework for studying intimate life in postcolonial Europe. Mixedness is defined as partnership across socially meaningful boundaries—such as religion, race, migration status, and legal category—where deviation from dominant norms shapes recognition, legitimacy, and belonging. The paper traces the historical trajectory of scholarship on mixed relationships, from early pathologizing and regulatory approaches to later emphases on lived experience and contemporary intersectional, power-sensitive analyses. Particular attention is given to religion as an axis of inequality and negotiation, shaped by secular Christian normativity, colonial legacies, and shifting regimes of marked and unmarked religion. Drawing on feminist theory, postcolonial studies, lived religion, and the politics of intimacy, the paper argues that mixed intimate life constitutes a crucial site where structural hierarchies are reproduced, contested, and reconfigured. Mixedness thus offers a lens through which broader societal power relations become visible, negotiated, and unsettled.