Dual couples whereby one or more dual is actually homosexual had been solicited through notices within the homosexual push and private word-of-mouth from 1980 for this. An 18-page survey throughout the “sexuality of twins” ended up being done by one or both twins. Thirty-eight pairs of monozygotic twins (34 male frames and 4 female sets) were discovered getting a concordance price of 65.8percent for homosexual positioning. Twenty-three pairs of dizygotic twins were found to own a concordance fee of 30.4percent for homosexual alignment. Also, three sets of triplets were collected. Two pieces included a set of monozygotic twins concordant for intimate placement utilizing the next triplet dizygotic and discordant for homosexual placement. A third triplet fix was actually monozygotic with all three concordant for homosexual positioning. These conclusions tends to be translated as supporting the debate for a biological grounds in sex-related positioning.
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