I hear people try to talk about "biological sex" and I shake my head because it’s clear that they don’t actually know what they are talking about. There are, at minimum, three ways to biologically define sex (1. Chromosomes & Genes 2. External Genitalia 3. Internal Reproductive Organs), and any or all of these may differ from the other two biological definitions. And we’re not even going to talk about gender identity, which can also differ from the three definitions, too! So, when someone says anything about biological sex and doesn't talk about at least a couple of these biological markers, then they are basing their biological knowledge off of their kindergarten teacher forcing kids into lunch lines based on boys and girls. I’m a psychologist, not a biologist or geneticists, so this might be pretty simplistic, but here's the most elementary definitions of sex and gender that we go over in my Human Sexuality course...
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