Expanding the Rainbow is the first comprehensive collection of research on the relationships of people who identify as bi+, poly, kinky, asexual, intersex, and/or trans that is written to be accessible to an undergraduate audience. The volume highlights a diverse range of identities, relationship structures, and understandings of bodies, sexualities, and interpersonal relationships. Contributions to the volume include original empirical research, personal narratives and reflections, and theoretical pieces that center the experiences of members of these communities, as well as teaching resources. Collectively, the chapters present a diverse, nuanced, and empirically rich picture of the variety of relationships and identities that individuals are creating in the twenty-first century.