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Chimerism

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What causes exclusive male homosexuality? This is the question I’ve addressed in the last few posts. The answer is still elusive although there seems to be consensus on some points. One such point is the relative importance of inborn causation versus environmental causation. In men, an exclusively homosexual orientation has a heritability of 30-45%. A... Read More
Steve Sailer has entered this debate with a post on the chimerism theory, i.e., the idea that male homosexuality arises when a male fetus absorbs cells from a female twin that has died during early fetal development. Chimerism appears to be more widespread than previously thought, but its actual incidence remains unknown (also see this... Read More
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