Genetic and Environmental Effects on Same-sex Sexual Behavior: A Population Study of Twins in Sweden
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There is still uncertainty about the relative importance of genes and environments on human sexual orientation. One reason is that previous studies employed self-selected, opportunistic, or small population-based samples. We used data from a truly population-based 2005–2006 survey of all adult twins (20–47 years) in Sweden to conduct the largest twin study of same-sex sexual behavior attempted so far. We performed biometric modeling with data on any and total number of lifetime same-sex sexual partners, respectively. The analyses were conducted separately by sex. Twin resemblance was moderate for the 3,826 studied monozygotic and dizygotic same-sex twin pairs. Biometric modeling revealed that, in men, genetic effects explained .34–.39 of the variance, the shared environment .00, and the individual-specific environment .61–.66 of the variance. Corresponding estimates among women were .18–.19 for genetic factors, .16–.17 for shared environmental, and 64–.66 for unique environmental factors. Although wide confidence intervals suggest cautious interpretation, the results are consistent with moderate, primarily genetic, familial effects, and moderate to large effects of the nonshared environment (social and biological) on same-sex sexual behavior.
- Bailey, J. M., Dunne, M. P., & Martin, N. G. (2000). Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample. Journal of Personality and Social Psychology, 78, 524–536. CrossRef
- Bailey, J. M., & Pillard, R. C. (1991). A genetic study of male sexual orientation. Archives of General Psychiatry, 48, 1089–1096.
- Bailey, J. M., Pillard, R. C., Dawood, K., Miller, M. B., Farrer, L. A., Trivedi, S., et al. (1999). A family history study of male sexual orientation using three independent samples. Behavior Genetics, 29, 79–86. CrossRef
- Bailey, J. M., Pillard, R. C., Neale, M. C., & Agyei, Y. (1993). Heritable factors influence sexual orientation in women. Archives of General Psychiatry, 50, 217–223.
- Baumeister, R. F. (2000). Gender differences in erotic plasticity: The female sex drive as socially flexible and responsive. Psychological Bulletin, 126, 347–374. CrossRef
- Caceres, C., Konda, K., Pecheny, M., Chatterjee, A., & Lyerla, R. (2006). Estimating the number of men who have sex with men in low and middle income countries. Sexually Transmitted Infections, 82(Suppl. 3), iii3–iii9. CrossRef
- Camperio-Ciani, A., Corna, F., & Capiluppi, C. (2004). Evidence for maternally inherited factors favoring male homosexuality and promoting female fecundity. Proceedings of the Royal Society of London, Series B, 271, 2217–2221. CrossRef
- Cochran, S. D., & Mays, V. M. (2000). Relation between psychiatric syndromes and behaviorally defined sexual orientation in a sample of the US population. American Journal of Epidemiology, 151, 516–523.
- Hamer, D. H., Hu, S., Magnuson, V. L., Hu, N., & Pattatucci, A. M. L. (1993). A linkage between DNA markers on the X chromosome and male sexual orientation. Science, 261, 321–327. CrossRef
- Hu, S., Pattatucci, A. M. L., Patterson, C., Li, L., Fulker, D. W., Cherny, S. S., et al. (1995). Linkage between sexual orientation and chromosome Xq28 in males but not in females. Nature Genetics, 11, 248–256. CrossRef
- Kendler, K. S., & Eaves, L. J. (1989). The estimation of probandwise concordance in twins: The effect of unequal ascertainment. Acta Geneticae Medicae et Gemellologiae, 38, 253–270.
- Kendler, K. S., Thornton, L. M., Gilman, S. E., & Kessler, R. C. (2000). Sexual orientation in a US national sample of twin and non-twin sibling pairs. American Journal of Psychiatry, 157, 1843–1846. CrossRef
- Kirk, K. M., Bailey, J. M., Dunne, M. P., & Martin, N. G. (2000). Measurement models for sexual orientation in a community twin sample. Behavior Genetics, 30, 345–356. CrossRef
- Lichtenstein, P., Sullivan, P. F., Cnattingius, S., Gatz, M., Johansson, S., Carlström, E., et al. (2006). The Swedish Twin Registry in the third millennium: An update. Twin Research and Human Genetics, 9, 875–882. CrossRef
- Lippa, R. A. (2006). Is high sex drive associated with increased sexual attraction to both sexes? It depends on whether you are male or female. Psychological Science, 17, 46–52. CrossRef
- Mustanski, B. S., DuPree, M. G., Nievergelt, C. M., Bocklandt, S., Schork, N. J., & Hamer, D. H. (2005). A genomewide scan of male sexual orientation. Human Genetics, 116, 272–278. CrossRef
- Neale, M. C. (1999). Mx: Statistical modeling (5th ed.). Richmond, VA: Virginia Commonwealth University.
- Rahman, Q. (2005). The neurodevelopment of human sexual orientation. Neuroscience and Biobehavioral Reviews, 29, 1057–1066. CrossRef
- Rahman, Q., Collins, A., Morrison, M., Orrells, J. C., Cadinouche, K., Greenfield, S., et al. (2007). Maternal inheritance and familial fecundity factors in male homosexuality. Archives of Sexual Behavior, doi:10.1007/s10508-007-9191-2.
- Rice, G., Anderson, C., Risch, N., & Ebers, G. (1999). Male homosexuality: Absence of linkage to microsatellite markers at Xq28. Science, 284, 665–667. CrossRef
- Sanders, A. R., Cao, Q., Zhang, J., Badner, J. A., Goldin, L. R., Guroff, J. J., et al. (1998). Genetic linkage study of male homosexual orientation. Poster presented at the meeting of the American Psychiatric Association, Toronto, Canada.
- Sandfort, T. G., Bakker, F., Schellevis, F. G., & Vanwesenbeeck, I. (2006). Sexual orientation and mental and physical health status: Findings from a Dutch population survey. American Journal of Public Health, 96, 1119–1125. CrossRef
- Sandfort, T. G., de Graaf, R., Bijl, R. V., & Schnabel, P. (2001). Same-sex sexual behavior and psychiatric disorders. Findings from the Netherlands mental health survey and incidence study. Archives of General Psychiatry, 58, 85–91. CrossRef
- Sell, R. L., Wells, J. A., & Wypij, D. (1995). The prevalence of homosexual behavior and attraction in the United States, the United Kingdom and France: Results of national population-based samples. Archives of Sexual Behavior, 24, 235–248. CrossRef
- Genetic and Environmental Effects on Same-sex Sexual Behavior: A Population Study of Twins in Sweden
Archives of Sexual Behavior
Volume 39, Issue 1 , pp 75-80
- Cover Date
- Print ISSN
- Online ISSN
- Springer US
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- Sexual behavior
- Sexual orientation
- Population survey
- Twin study
- Industry Sectors
- Author Affiliations
- 1. Centre for Violence Prevention, Karolinska Institutet, P.O. Box 23000, 104 35, Stockholm, Sweden
- 2. School of Biological Sciences, Queen Mary-University of London, London, UK
- 3. Institute of Psychiatry, King’s College-University of London, London, UK
- 4. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden