Being human entails an astonishingly complex interplay of biology and culture, and while there are important differences between women and men, there is a lot more variation and overlap than we may realize. ‘Sex Is a Spectrum’ offers a bold new paradigm for understanding the biology of sex, drawing on the latest science to explain why the binary view of the sexes is fundamentally flawed – and why having XX or XY chromosomes isn’t as conclusive as some would have us believe. In this lively and provocative book, leading biological anthropologist Agustn Fuentes begins by tracing the origin and evolution of sex, describing the many ways in the animal kingdom of being female, male, or both.