Article

Archives of Sexual Behavior

, Volume 29, Issue 5, pp 463-478

First online:

Fraternal Birth Order and Sexual Orientation in Pedophiles

  • Ray BlanchardAffiliated withCentre for Addiction and Mental Health, Department of Psychiatry, Faculty of Medicine, University of TorontoCAMH—Clarke Division
  • , Howard E. BarbareeAffiliated withCentre for Addiction and Mental Health, Department of Psychiatry, Faculty of Medicine, University of Toronto
  • , Anthony F. BogaertAffiliated withHealth Studies Program, Brock University
  • , Robert DickeyAffiliated withCentre for Addiction and Mental Health, Department of Psychiatry, Faculty of Medicine, University of Toronto
  • , Philip KlassenAffiliated withCentre for Addiction and Mental Health, Department of Psychiatry, Faculty of Medicine, University of Toronto
  • , Michael E. KubanAffiliated withCentre for Addiction and Mental Health
  • , Kenneth J. ZuckerAffiliated withCentre for Addiction and Mental Health, Department of Psychiatry, Faculty of Medicine, University of Toronto

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Abstract

Whether homosexual pedophiles have more older brothers (a higher fraternal birth order) than do heterosexual pedophiles was investigated. Subjects were 260 sex offenders (against children age 14 or younger) and 260 matched volunteer controls. The subject's relative attraction to male and female children was assessed by phallometric testing in one analysis, and by his offense history in another. Both methods showed that fraternal birth order correlates with homosexuality in pedophiles, just as it does in men attracted to physically mature partners. Results suggest that fraternal birth order (or the underlying variable it represents) may prove the first identified universal factor in homosexual development. Results also argue against a previous explanation of the high prevalence of homosexuality in pedophiles (25% in this study), namely, that the factors that determine sexual preference in pedophiles are different from those that determine sexual preference in men attracted to adults. An alternative explanation in terms of canalization of development is suggested.

birth order canalization homosexuality pedophilia phallometry sexual orientation sibling sex ratio