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That's not true though. Sex is defined by the chromosomes, not the organs and they don't suddenly change after 6 weeks. This definition however leaves intersexual people out, but that's certainly intentional
Males are just females with one badly deformed X-chromosome, a dick and a ridiculous amount of testosterone.
No. Sex is determined by genes. Usually SRY, but other genes play a role in sexual determination.
It's defined based on which reproductive cell the animal produces. Larger means female, smaller means male. Producing both is intersex. In humans, the SRY gene usually sets the path towards male development. But not always. Sometimes the person is insensitive to testosterone and won't produce either large or small gamates, for example. Hence, xx or xy chromosomes don't define sex. And chromosomes alone don't determine it, but the entire gene code.
The EO tried to dodge science, and failed. Because sex isn't binary, and attempting to make it binary ends up with nonsense like making everyone legally sexless.