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Homosexual orientation in twins: a report on 61 pairs and three triplet sets.
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Homosexual orientation in twins: a report on 61 pairs and three triplet sets. - PubMed - NCBI
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Description:In a study population composed of more than participants, Ellis et al. This may correlate with left-handedness. Although wide confidence intervals suggest cautious interpretation, the results are consistent with moderate, primarily genetic, familial effects, and moderate to large effects of the nonshared environment social and biological on same-sex sexual behavior. The researchers found a significant difference in INAH3 size between heterosexual men and heterosexual women.