Opposite-Sex Twins and Adolescent Same-Sex Attraction

Bearman, Peter Shawn; Brückner, Hannah

The authors consider social, genetic, evolutionary, and hormonal transfer hypotheses for same-sex romantic preferences of adolescent (N=5,552) sibling pairs drawn from a nationally representative sample. They show that male but not female opposite-sex twins disproportionately report same-sex attraction; and that the pattern of concordance of same-sex preference among siblings is inconsistent with a simple genetic influence model. Their results provide substantial support for the role of social influences, reject the hormone transfer model, reject a speculative evolutionary theory, and are consistent with a general model that allows for genetic expression of same-sex attraction under specific, highly circumscribed, social conditions.


More About This Work

Academic Units
Institute for Social and Economic Research and Policy
Interdisciplinary Center for Innovative Theory and Empirics
Institute for Social and Economic Research and Policy, Columbia University
ISERP Working Papers, 01-04
Published Here
August 23, 2010