"Sex change" doesn't exist—30 trillion cells in our bodies, 300 times more than the stars in the Milky Way, each carrying the genetic code for our sex. Even if you could alter each at a rate of one per second, it would take you 57 million years to "change the sex" of one person.
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Nonsense. All you have to do is compelled speech.
Not to mention chromosomes and genetic makeup remain the same.