Dual couples during a minumum of one twin are homosexual are solicited through announcements when you look at the gay press and private word-of-mouth from 1980 to the current. An 18-page form regarding “sexuality of twins” got filled out by either twins. Thirty-eight pairs of monozygotic twins (34 male couples and 4 feminine pairs) comprise receive to experience a concordance fee of 65.8per cent for homosexual placement. Twenty-three couples of dizygotic twins comprise receive to have a concordance speed of 30.4per cent for homosexual direction. In addition, three pieces of triplets are gotten. Two pieces covered some monozygotic twins concordant for sex-related direction utilizing the third triplet dizygotic and discordant for homosexual orientation. A 3rd triplet set had been monozygotic with all of three concordant for homosexual placement. These studies is viewed as giving support to the debate for a biological grounds in sex-related alignment.
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