It isn’t really accurate to talk about body “parts” in the way that we might talk about “parts” of a car or a Lego set. If a wheel is removed from a car, it remains a wheel. By contrast, if a foot is removed from a human, it ceases to be a foot and soon decomposes. A foot exists in order to walk, but it can’t walk unless it works in concert with an ankle, a leg, blood vessels, a nervous system, and so on. A foot’s very activity of walking depends on belonging to a whole, therefore the whole determines its being.
It’s the existence of the whole that actually determines sex. Specifically, it’s the relationship of a whole person to the act of bringing another whole person into existence.
Generating new human life is done by the whole person, not merely a part. It’s more accurate to speak about sex, not so much as a removable part of a person, but as an aspect.
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