I was watching Family Feud one day, and the question was "what is the largest state?" The #1 answer was of course, Texas. By your way of thinking, I got it wrong when I said Alaska, because "the fact that there are those that disagree with you demonstrates that."
Women are females beyond the age of puberty, and females have ovaries containing egg cells. This is the origin of the term and the entire reason we have binary gender classification, it was based on reproductive function. It's okay if you want to change that, but no new meaning will change the biological facts behind it. And the reason for our laws is also based on reproductive function. So if you want to use semantic arguments to claim the words "woman" and "female" as gender instead of sex, maybe we need new terms for the sexes, but it still makes more sense to define laws based on biology than gender.