It is binary if you define it as a concept of reproduction, which it is. Every human that has ever been born had two parents. Looks pretty binary. Intersex people and edge cases cannot reproduce naturally, to my knowledge. So only those belonging to those two specific biological categories of sexual reproduction (males & females) can reproduce.
Also sex is defined by a pair of chromosomes, at conseption sex cells merge, each of them has only 23 chromosomes, the resulting cell has 46, which is why they say that sex is defined at conception, you can’t determine the sex at this stage without destroying the single cell (zygote), but the chromosomes will not change nevertheless
It is binary if you define it as a concept of reproduction, which it is. Every human that has ever been born had two parents. Looks pretty binary. Intersex people and edge cases cannot reproduce naturally, to my knowledge. So only those belonging to those two specific biological categories of sexual reproduction (males & females) can reproduce.
Also sex is defined by a pair of chromosomes, at conseption sex cells merge, each of them has only 23 chromosomes, the resulting cell has 46, which is why they say that sex is defined at conception, you can’t determine the sex at this stage without destroying the single cell (zygote), but the chromosomes will not change nevertheless