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PLoS One. 2011;6(7):e21982. doi: 10.1371/journal.pone.0021982. Epub 2011 Jul 7.

Genetic and environmental influences on female sexual orientation, childhood gender typicality and adult gender identity.

Author information

1
Biological and Experimental Psychology Group, School of Biological and Chemical Sciences, Queen Mary University of London, London, United Kingdom. a.burri@qmul.ac.uk

Abstract

BACKGROUND:

Human sexual orientation is influenced by genetic and non-shared environmental factors as are two important psychological correlates--childhood gender typicality (CGT) and adult gender identity (AGI). However, researchers have been unable to resolve the genetic and non-genetic components that contribute to the covariation between these traits, particularly in women.

METHODOLOGY/PRINCIPAL FINDINGS:

Here we performed a multivariate genetic analysis in a large sample of British female twins (Nā€Š=ā€Š4,426) who completed a questionnaire assessing sexual attraction, CGT and AGI. Univariate genetic models indicated modest genetic influences on sexual attraction (25%), AGI (11%) and CGT (31%). For the multivariate analyses, a common pathway model best fitted the data.

CONCLUSIONS/SIGNIFICANCE:

This indicated that a single latent variable influenced by a genetic component and common non-shared environmental component explained the association between the three traits but there was substantial measurement error. These findings highlight common developmental factors affecting differences in sexual orientation.

PMID:
21760939
PMCID:
PMC3131304
DOI:
10.1371/journal.pone.0021982
[Indexed for MEDLINE]
Free PMC Article

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