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> Or they may not identify as female.

I thought the male/female dichotomy was the one meant to be separated from matters of identity, and simply be a biology based designation. I understand identifying as man or woman or neither is a self determined social designation; but how can someone claim that they are not female if they have two X chromosomes?

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Because biology is far more complicated than the binary presence of an X or Y chromosome.

The easiest way to explain this is that being intersex also exists in biology:

https://en.m.wikipedia.org/wiki/Intersex_(biology)

Some folks who identify as women might not identify as female. This might be true even for cisgender women in rare cases. An infertile XY person may be born with female genitalia in rare cases, and be raised as a woman only to discover later in life they have the typically male chromosomes.

These sets of people are small, but non zero. It's probably safe to say nearly all XX people identify as female.

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