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The book argues for a roughly 10%/90% nature/nurture effect in homosexuality and claims that any genetic effect is very indirect eg: any physical characteristic making a person feel gender-atypical. The book shows that homosexual orientation is not fixed but that change is possible. It contains arguments not found elsewhere. Using orthodox science and summarising thousands of scientific publications and papers, it is nevertheless very accessible to the average  reader. The book covers the development of homosexual and heterosexual orientation, instincts, intersexes, culture, prenatal hormonal exposure, neurology, and genetics.