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Archives of Sexual Behavior

, Volume 29, Issue 4, pp 349–356 | Cite as

Birth Order in a Contemporary Sample of Gay Men

  • David W. Purcell
  • Ray Blanchard
  • Kenneth J. Zucker
Article

Abstract

The birth order of a contemporary North American sample of 97 gay men was quantified using Slater's Index. For the 84 probands with at least one sibling, the results showed a late mean birth order compared with the expected value of .50. Additional birth order indices derived from Slater's Index suggested that the mean later birth order was accounted for more strongly by the proband's number of older brothers than by his number of older sisters. The present findings constitute a replication of a series of recent studies and add to the growing body of evidence that birth order is a reliable correlate of sexual orientation in males.

birth order sex ratio sexual orientation homosexuality males 

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Copyright information

© Plenum Publishing Corporation 2000

Authors and Affiliations

  • David W. Purcell
    • 1
  • Ray Blanchard
    • 2
    • 3
  • Kenneth J. Zucker
    • 4
    • 5
  1. 1.Department of PsychologyEmory UniversityAtlanta
  2. 2.Clinical Sexology ProgramCentre for Addiction and Mental Health—Clarke Division;Toronto
  3. 3.Department of Psychiatry, Faculty of MedicineUniversity of TorontoCanada
  4. 4.Child and Adolescent Gender Identity Clinic, Child Psychiatry ProgramCentre for Addiction and Mental Health—Clarke Division;OntarioCanada;
  5. 5.Department of Psychiatry, Faculty of MedicineUniversity of TorontoCanada

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