Twin frames during more than one twin was homosexual happened to be solicited through notices inside homosexual newspapers and personal suggestions from 1980 to the current. An 18-page form from the “sexuality of twins” got filled out by one or both twins. Thirty-eight frames of monozygotic twins (34 male frames and 4 female frames) had been realized to experience a concordance rates of 65.8per cent for homosexual orientation. Twenty-three pairs of dizygotic twins are discover getting a concordance rate of 30.4percent for homosexual alignment. Besides, three pieces of triplets happened to be collected. Two set contained a couple of monozygotic twins concordant for sexual direction aided by the next triplet dizygotic and discordant for homosexual placement. One third triplet preset got monozygotic with three concordant for homosexual direction. These studies is construed as supporting the point for a biological grounds in sexual positioning.
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