In his new book “Sex is a Spectrum: The Biological Limits of the Binary,” Princeton biological anthropologist Agustin Fuentes makes the case that among animals, including humans, sex variation and reproductive biology is far more complex and fluid than we think. We discuss why many of the assumptions about male and female differences are more cultural than biological, and what intersex earthworms and fish that switch sexes can teach us about gender and sex.

Guests:

Agustín Fuentes, anthropologist, Princeton University; his latest book is called "Sex is a Spectrum"

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