It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

A wave of pseudoscientific papers has tried to dismantle one of biology’s most fundamental truths: only two sexes exist, male and female. These papers often claim that sex is a broad “spectrum,” and ...

Human reproduction requires both male and female gametes. Gametes are special sex cells that contain the genetic information necessary to create a new life. Men produce millions of gametes called ...

The Alabama House of Representatives passed a bill on Thursday that would define biological sex in binary terms based on individuals’ reproductive systems rather than their gender identity. House Bill ...

An Alabama Senate committee advanced a bill to define an individual’s sex based on reproductive anatomy. Senate Bill 92 “would define man, woman, boy, girl, father, mother, male, female, and sex for ...