Birth order and sibling sex ratio of children and adolescents referred to a gender identity service.

In adult male samples, homosexuality is associated with a preponderance of older brothers (i.e., the fraternal birth order effect). In several studies comparing gender dysphoric youth, who are likely to be homosexual in adulthood, to clinical or non-clinical control groups, the findings have been co...

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Bibliographic Details
Main Authors: Doug P Vanderlaan, Ray Blanchard, Hayley Wood, Kenneth J Zucker
Format: Article
Language:English
Published: Public Library of Science (PLoS) 2014-01-01
Series:PLoS ONE
Online Access:http://europepmc.org/articles/PMC3961213?pdf=render