Litterally speaking: If men ruled the world and there were NO women at all then the race of men would die in one generation, because there are no women to concieve. No birthing, which means no humens, which means the humens that exist will eventually die off and there will be nobody at all. But that is just an extreme case of men ruling the world without women of coarse. Same goes with women. If there were just women and no men then they too would die off because there are no men to fertilize during sex.
But of coarse I am being too literal here and we know that will never happen.
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