1. United States
2. Mich.
3. Letter

Stop writing laws that treat biological sex as a simple binary — the science doesn't support it. Biologists and physicians have long established that sex-related biological traits overlap between females and males, and that intersex variations occur in up to 6% of the population. When primary traits like chromosomes, gonads, and genitals can each point in different directions within a single person, no single marker can define someone's sex category. Legislation that pretends otherwise isn't grounded in biology — it's grounded in ideology. The consequences are real. Laws built on a false binary exclude and harm people whose bodies don't fit a rigid two-box system. Even elite sports regulators like the International Olympic Committee have changed their definition of biological sex multiple times over the past century — from genitals to chromosomes to testosterone — because no single definition holds up. If policymakers can't agree on what biological sex even means, they shouldn't be using it as the foundation for civil rights, healthcare access, or legal recognition. Craft policy that reflects the complexity of human biology, not a myth.