“My father didn't come right out and state that all their earlier informants had lied to them, but he explained that—apart from a few surviving contemporaries of the travelers themselves—there'd been nothing resembling sexual dimorphism in the descendants of humans, anywhere, for more than nineteen thousand years. Long before any extrasolar world was settled, it had gone the way of war, slavery, parasites, disease, and quantum indecisiveness. And apart from trivial local details, like the exact age of sexual maturity and the latency period between attraction and potency, he and his lover
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