Archives of Sexual Behavior

, Volume 39, Issue 1, pp 81–92

Common Genetic Effects of Gender Atypical Behavior in Childhood and Sexual Orientation in Adulthood: A Study of Finnish Twins

  • Katarina Alanko
  • Pekka Santtila
  • Nicole Harlaar
  • Katarina Witting
  • Markus Varjonen
  • Patrik Jern
  • Ada Johansson
  • Bettina von der Pahlen
  • N. Kenneth Sandnabba
Original Paper

Abstract

The existence of genetic effects on gender atypical behavior in childhood and sexual orientation in adulthood and the overlap between these effects were studied in a population-based sample of 3,261 Finnish twins aged 33–43 years. The participants completed items on recalled childhood behavior and on same-sex sexual interest and behavior, which were combined into a childhood gender atypical behavior and a sexual orientation variable, respectively. The phenotypic association between the two variables was stronger for men than for women. Quantitative genetic analyses showed that variation in both childhood gender atypical behavior and adult sexual orientation was partly due to genetics, with the rest being explained by nonshared environmental effects. Bivariate analyses suggested that substantial common genetic and modest common nonshared environmental correlations underlie the co-occurrence of the two variables. The results were discussed in light of previous research and possible implications for theories of gender role development and sexual orientation.

Keywords

Gender identity Gender role behavior Sexual orientation Sex differences Behavior genetics 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Katarina Alanko
    • 1
  • Pekka Santtila
    • 1
  • Nicole Harlaar
    • 1
  • Katarina Witting
    • 1
  • Markus Varjonen
    • 1
  • Patrik Jern
    • 1
  • Ada Johansson
    • 1
  • Bettina von der Pahlen
    • 1
  • N. Kenneth Sandnabba
    • 1
  1. 1.Center of Excellence for Behavior Genetics, Department of PsychologyÅbo Akademi UniversityTurkuFinland

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