Document Detail

Homosexual orientation in twins: a report on 61 pairs and three triplet sets.
MedLine Citation:
PMID:  8494487     Owner:  NLM     Status:  MEDLINE    
Twin pairs in which at least one twin is homosexual were solicited through announcements in the gay press and personal referrals from 1980 to the present. An 18-page questionnaire on the "sexuality of twins" was filled out by one or both twins. Thirty-eight pairs of monozygotic twins (34 male pairs and 4 female pairs) were found to have a concordance rate of 65.8% for homosexual orientation. Twenty-three pairs of dizygotic twins were found to have a concordance rate of 30.4% for homosexual orientation. In addition, three sets of triplets were obtained. Two sets contained a pair of monozygotic twins concordant for sexual orientation with the third triplet dizygotic and discordant for homosexual orientation. A third triplet set was monozygotic with all three concordant for homosexual orientation. These findings are interpreted as supporting the argument for a biological basis in sexual orientation.
F L Whitam; M Diamond; J Martin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Archives of sexual behavior     Volume:  22     ISSN:  0004-0002     ISO Abbreviation:  Arch Sex Behav     Publication Date:  1993 Jun 
Date Detail:
Created Date:  1993-06-14     Completed Date:  1993-06-14     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  1273516     Medline TA:  Arch Sex Behav     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  187-206     Citation Subset:  IM    
Department of Sociology, Arizona State University, Tempe 85287-2101.
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MeSH Terms
Genetics, Behavioral
Middle Aged
Triplets / psychology*
Twins, Dizygotic / psychology*
Twins, Monozygotic / psychology*

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