Twin pairs in which at least one dual was homosexual were solicited through reports through the gay push and private suggestions from 1980 to the current. An 18-page survey regarding the “sexuality of twins” ended up being filled out by either twins. Thirty-eight pairs of monozygotic twins (34 male pairs and 4 feminine pairs) were determine to have a concordance fee of 65.8% for homosexual orientation. Twenty-three frames of dizygotic twins were receive to own a concordance fee of 30.4% for homosexual placement. As well as, three units of triplets were collected. Two set consisted of a set of monozygotic twins concordant for erotic alignment because of the 3rd triplet dizygotic and discordant for homosexual direction. One third triplet put was monozygotic for all three concordant for homosexual direction. These results tends to be construed as supporting the assertion for a biological factor in sex-related placement.
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