Abstract
Dual pairs where one or more double is homosexual were solicited through reports in homosexual newspapers and personal suggestions from 1980 to the current. An 18-page questionnaire from the “sexuality of twins” got done by either twins. Thirty-eight couples of monozygotic twins (34 male frames and 4 feminine pairs) were realized to own a concordance rates of 65.8% for homosexual direction. Twenty-three pairs of dizygotic twins are located getting a concordance speed of 30.4% for homosexual direction. Also, three designs of triplets are acquired. Two designs contained a couple of monozygotic twins concordant for sex-related positioning employing the next triplet dizygotic and discordant for homosexual positioning. One third triplet fix was monozygotic along with three concordant for homosexual placement. These conclusions tend to be interpreted as supporting the assertion for a biological foundation in sex-related positioning.
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