That's why those that can deliver a baby are matching chromosomes XX, and those that deliver sperm are nonmatched XY.
That's why with every mammalian species, embryos are indistinguishable from female for the first like 1/4 to 1/3 of the development cycle, until the 'male sex characteristics' start developing, ovaries become testicles, etc.
Females are the fundamental expression of all species, and the existence of 'males' is just an evolutionarily advantageous expression (for a species as a whole), so that meiosis can be the foundation of reproduction (creating far more mutations vs mitosis, and hence, better adaptability to environment).
In my book, we're basically all female ... except for 50% where the female essence mutates into male form.
The biological/developmental process of transforming the fundamentally female embryo into a male one ... is far from complete/perfect ... in a GREAT many cases. In turn, IMHO, this explains to some degree why there's way more trans women than trans men, and more gay men than gay women.
And why 'Eve was made from Adam' is just total freaking bullshit. 
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