Behavior Genetics

, Volume 30, Issue 4, pp 345–356 | Cite as

Measurement Models for Sexual Orientation in a Community Twin Sample

  • K. M. Kirk
  • J. M. Bailey
  • M. P. Dunne
  • N. G. Martin

Abstract

Multivariate structural equation modeling techniques have been applied to examine the causes of individual differences in responses to several items concerning sexual orientation. To minimize potential ascertainment and response biases, the study sample involved a large (N = 4901) community-based cohort of Australian twins aged 18–52 who answered an anonymous questionnaire on sexual behavior and attitudes. The statistical power of the analysis was increased by the availability of multiple measures of sexual orientation (behaviors, attitudes and feelings), providing stronger evidence for the existence of additive genetic influences on this phenotype than in a previous analysis (Bailey et al., 2000). Estimates of the heritability of homosexuality in this sample ranged between 50 and 60% in females but were significantly lower (heritability of approximately 30%) in males.

Homosexuality sexual orientation heritability twins 

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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • K. M. Kirk
    • 1
  • J. M. Bailey
    • 2
  • M. P. Dunne
    • 3
  • N. G. Martin
    • 3
  1. 1.Queensland Institute of Medical Research and Joint Genetics ProgramThe University of QueenslandBrisbaneAustralia
  2. 2.Department of PsychologyNorthwestern UniversityEvanston
  3. 3.Queensland Institute of Medical Research and Joint Genetics ProgramThe University of QueenslandBrisbaneAustralia
  4. 4.School of Public HealthQueensland University of TechnologyBrisbaneAustralia

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