The fact that the rate of homosexual concordance is substantially higher for identical twins than for nonidentical twins shows that

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The higher rate of homosexual concordance in identical twins suggests a genetic contribution to determining sexual orientation. If environmental factors were solely responsible for sexual orientation, then the rate of concordance would be similar for both identical and nonidentical twins. This finding supports the idea that sexual orientation is not solely determined by cultural factors or personal choice, but is influenced by hereditary factors as well.

The Fact That the Rate of Homosexual Concordance Is Substantially