From Sex To Gender: The Modern Dismissal of Biology

“…Male and female are not capricious categories imposed by scientists on the natural world, but rather refer to fundamental distinctions deeply rooted in evolution…

and

…The assertion that male and female are arbitrary classifications is false on every level. Not only does it confuse primary sexual characteristics⁶ (i.e., the reproductive organs) which are unambiguously male or female at birth 99.8 percent of the time with secondary sexual characteristics⁷ (e.g., more hair on the faces of men or larger breasts in women), it ignores the very definition of biological sex — men produce many small sex cells termed sperm while women produce fewer large sex cells termed eggs. Although much is sometimes made of the fact that sex differences in body size, hormonal profiles, behavior, and lots of other traits vary across species, that these differences are minimal or non-existent in some species, or that a small percentage of individuals, due to disorders of development, possess an anomalous mix of female and male traits,⁸ that does not undermine this basic distinction. There is no third sex. Sex is, by definition, binary…”