Sex Is a Spectrum The Biological Limits of the Binary

"Reproductive anatomy is more variable than commonly understood, according to this eye-opening study [...] The raft of research convincingly debunks the idea that sex anatomy has much consequence on behavior, character, or cognitive ability [...] and the illuminating discussions of animal biology demonstrate the profound diversity of sex expression in nature [...] [Sex is a Spectrum is] a resounding refutation of the idea that there's anything natural about the gender binary."
– Publishers Weekly

"There has been an outpouring of new research on the nonbinary nature of sex and gender, both in humans and in nonhuman animals. Agustín Fuentes has put it all together in a readable and up-to-date narrative. Sex Is a Spectrum will help us move past the sex/gender binary and allow us to understand and embrace human diversity."
– Anne Fausto-Sterling, author of Sexing the Body: Gender Politics and the Construction of Sexuality

"Agustín Fuentes is a pedigreed and fearless thinker with a talent for carefully debunking cultural myths using hard facts and ruthless logic. Through a litany of research and great storytelling, he explains how the unique biocultural nature of humans makes binary expectations of our sex biology problematic. A fascinating must-read for anyone interested in the science of human sex and gender."
– Lucy Cooke, author of Bitch: On the Female of the Species

"Invaluable in our era of culture wars, Sex Is a Spectrum shows in clear, accessible language how sex biology is far from a simple binary. Fuentes demonstrates how humans fit into an array of wonderful and often surprising animal sex and reproductive diversity while also highlighting what makes us unique. The result is a fascinating, informative exploration of how people experience the dynamic intersections between bodies, minds, and culture."
– Rebecca Wragg Sykes, author of Kindred: Neanderthal Life, Love, Death and Art

"The fact that sex is complicated isn't weird. It's weird to think it wouldn't be. A lively introduction to the topic from a scientist who's a force for good."
– Cat Bohannon, author of Eve: How the Female Body Drove 200 Million Years of Human Evolution