Intimate Relationships is a comprehensive survey of relationship science that draws on social psychology, communication studies, family studies, sociology, clinical psychology, neuroscience, demography, and economics. The ninth edition has unmatched currency and breadth. It has new or substantially expanded treatment of gender, sexual orientation, consensual non-monogamy, and transgenders’ relationships. It speaks to, and includes, everyone. From back burner relationships to stealthing and selfishness and on to humility and life history theory, everything new and cutting-edge in relationship science is here.