When it comes to variation within the sexes, binary thinking is just bad science. Please join Science on Tap in welcoming Agust铆n Fuentes, author of Sex Is a Spectrum. Hear the case that ideas about what a man or woman 鈥渟hould look like鈥� are the product of culture, not biology. Indeed, traits that we think are inherently male or female 鈥� body hair, breast tissue 鈥� are not limited to one sex. And a close focus on hormones doesn鈥檛 always tell the full story either.