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


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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  1. Akaike, H. (1987). Factor analysis and aic. Psychometrika 52:317–322.Google Scholar
  2. Bailey, J. M., and Bell, A. P. (1993). Familiality of female and male homosexuality. Behav. Genet. 23:313–322.PubMedGoogle Scholar
  3. Bailey, J. M., and Benishay, D. S. (1993). Familial aggregation of female sexual orientation. Am. J. Psychiatry 150:272–277.PubMedGoogle Scholar
  4. Bailey, J. M., and Pillard, R. C. (1991). A genetic study of male sexual orientation. Arch. Gen. Psychiatry 48:1089–1096.PubMedGoogle Scholar
  5. Bailey, J. M., Pillard, R. C., Neale, M. C., and Agyei, M. A. (1993). Hertiable factors influence sexual orientation in women. Arch. Gen. Psychiatry 50:217–223.PubMedGoogle Scholar
  6. Bailey, J. M., Dunne, M. P., and Martin, N. G. (2000). The distribution, correlates and determinants of sexual orientation in an Australian twin sample. J. Pers. Soc. Psychol. 78:524–536.PubMedGoogle Scholar
  7. Baker, L. A., Treloar, S. A., Reynolds, C., Heath, A. C., and Martin, N. G. (1996). Genetics of educational attainment in Australian twins: Sex differences and secular changes. Behav. Genet. 26:89–102.PubMedGoogle Scholar
  8. Dunne, M. P., Martin, N. G., Bailey, J. M., Heath, A. C., Bucholz, K. K., Madden, P. A. F., Statham, D. J. (1997). Participation bias in a sexuality survey: Psychological and behavioural characteristics of responders and non-responders. Int. J. Epidemiol. 26:844–854.PubMedGoogle Scholar
  9. Eaves, L. J., Eysenck, H. J., and Martin, N. G. (1989). Genes, Culture and Personality: An Empirical Approach, Academic Press, New York.Google Scholar
  10. Gangestad, S. W., Bailey, J. M., and Martin, N. G. (2000). Taxometric analyses of sexual orientation and gender identity. J. Pers. Soc. Psychol. 78:1109–1121.PubMedGoogle Scholar
  11. Jardine, R., and Martin, N. G. (1984). Causes of variation in drinking habits in a large twin sample. Acta Genet. Med. Gemellol (Roma) 33:435–450.Google Scholar
  12. Jardine, R., Martin, N. G., and Henderson, A. S. (1984). Genetic covariation between neuroticism and the symptoms of anxiety and depression. Genet. Epidemiol. 1:89–107.PubMedGoogle Scholar
  13. Jöreskog, K. G., and Sörbom, D. (1998). LISREL 8.20 and PRELIS 2.20 for Windows, Scientific Software, Chicago.Google Scholar
  14. Kasriel, J., and Eaves, L. J. (1976). A comparison of the accuracy of written questionnaires with blood-typing for diagnosing zygosity in twins. J. Biosoc. Sci. 8:263–266.PubMedGoogle Scholar
  15. Kendler, K. S., and Eaves, L. J. (1989). The estimation of probandwise concondance in twins: The effect of unequal ascertainment. Acta Genet. Med. Gemellol. (Roma) 38:253–270.Google Scholar
  16. Kendler, K., Heath, A., Martin, N., and Eaves, L. J. (1987). Symptoms of anxiety and symptoms of depression. Same genes, different environments? Arch. Gen. Psychiatry 44:451–457.PubMedGoogle Scholar
  17. Kinsey, A. C., Pomeroy, W. B., and Martin, C. E. (1948). Sexual Behavior in the Human Male, W. B. Saunders, Philadelphia and London.Google Scholar
  18. Martin, N. G., and Martin P. G. (1975). The inheritance of scholastic abilities in a sample of twins. I. Ascertainment of the sample and diagnosis of zygosity. Ann. Hum. Genet. 39:213–218.PubMedGoogle Scholar
  19. Neale, M. C. (1999). Mx: Statistical Modelling, 4th ed., Department of Psychiatry, Medical College of Virginia, Richmond.Google Scholar
  20. Neale, M. C., and Cardon, L. R. (1992). Methodology for Genetic Studies of Twins and Families, Kluwer Academic, Dortrecht.Google Scholar
  21. Neale, M. C., and Eaves, L. J. (1993). Estimating and controlling for the effects of volunteer bias with pairs of relatives. Behav. Genet. 23:271–277.PubMedGoogle Scholar
  22. Neale, M. C., Eaves, L. J., and Kendler, K. S. (1994). The power of the classical twin study to resolve variation in threshold traits. Behav. Genet. 24:239–258.PubMedGoogle Scholar
  23. Ooki, S., Yamada, K., Asaka, A., and Hayakawa, K. (1990). Zygosity diagnosis of twins by questionnaire. Acta Genet. Med. Gemellol. (Roma) 39:109–115.Google Scholar
  24. Pattatucci, A. M. L., and Hamer, D. H. (1995). Development and familiality of sexual orientation in females. Behav. Genet. 25:407–420.PubMedGoogle Scholar
  25. Pillard, R. C. (1990). The Kinsey Scale: Is it familial? In McWhirter, D. P., Sanders, S. A., and Reinisch, J. M. (eds.), Homosexuality/Heterosexuality: Concepts of Sexual Orientation, Oxford University Press, New York, pp. 88–100.Google Scholar
  26. Pillard, R. C., and Bailey, J. M. (1998). Human sexual orientation has a heritable component. Hum. Biol. 70:347–365.PubMedGoogle Scholar
  27. Pillard, R. C., and Weinrich, J. D. (1986). Evidence of familial nature of male homosexuality. Arch. Gen. Psychiatry 43:808–812.PubMedGoogle Scholar
  28. SAS Institute (1996). SAS Version 6.11 [Computer program], SAS Institute, Cary, NC.Google Scholar
  29. Wellings, K., Wadsworth, J., and Johnson A. (1994). Sexual diversity and homosexual behavior. In Wellings, K., Field, J., Johnson, A., and Wadsworth, J. (eds.), Sexual Behaviour in Britain, Penguin, London, pp. 178–229.Google Scholar

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

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