evolution of (social) gender

"Know the masculine, keep to the feminine."
~ Lao Tzu (570-490 BC)
... found at GenderEvolve (blog)

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"Male and female represent the two sides of the great radical dualism. But in fact they are perpetually passing into one another. Fluid hardens to solid, solid rushes to fluid. There is no wholly masculine man, no purely feminine woman."
~ Margaret Fuller (1810-1850)
... found at GenderEvolve (WebSite)