Juxtaposing contributions from geneticists and anthropologists, this volume provides a contemporary overview of cousin marriage and what is happening at the interface of public policy, the management of genetic risk and changing cultural practices in the Middle East and in multi-ethnic Europe. It offers a cross-cultural exploration of practices of cousin marriage in the light of new genetic understanding of consanguineous marriage and its possible health risks. Overall, the volume presents a reflective, interdisciplinary analysis of the social and ethical issues raised by both the discourse of risk in cousin marriage, as well as existing and potential interventions to promote “healthy consanguinity” via new genetic technologies.