That's naive, Vitor. Gender based sports is the primary filtering for body-structure. The male musculature is very different than female musculature. Adding a mixed category can make sense in some sports but not in all.

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The musculature is radically different between men and women. That is not trivial. Female-only sports is necessary and will npt go away. Women cannot compete physically with men. Gender is not an understanding. We are either born XY or XX. However, we might need a "cyborg" or "body modification" category in the distant future.