Abstract
Summary This is a report on a pair of monozygotic twins who showed differences in gender role behavior from early childhood, one following an essentially feminine-type pattern and the other a masculine one, one later becoming homosexual and the other heterosexual. This type of development is present in other monozygotic twins discordant for homosexuality reported in the literature, where the pattern of the homosexual child resembles the syndrome of effeminate behavior described for single-born children. In this syndrome, familial environmental factors have been found not to be significant in the development of the homosexuality, and therefore, the discordance in the psychosexual development of monozygotic twins cannot be ascribed to the differential effect of these factors on them. Other possible explanations have been considered.
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