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Fraternal Birth Order and Sexual Orientation in Pedophiles

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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.

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REFERENCES

  • ACSF Investigators. (1992). AIDS and sexual behaviour in France. Nature 360: 407–409.

    Google Scholar 

  • Bailey, J. M., and Zucker, K. J. (1995). Childhood sex-typed behavior and sexual orientation: A conceptual analysis and quantitative review. Dev.Psychol. 31: 43–55.

    Google Scholar 

  • Bem, D. J. (1996). Exotic becomes erotic: A developmental theory of sexual orientation. Psych.Rev. 103: 320–335.

    Google Scholar 

  • Billy, J. O. G., Tanfer, K., Grady, W. R., and Klepinger, D. H. (1993). The sexual behavior of men in the United States. Fam.Plann.Perspect. 25: 52–60.

    PubMed  Google Scholar 

  • Blanchard, R. (1991). Clinical observations and systematic studies of autogynephilia. J.Sex Marital Ther. 17: 235–251.

    PubMed  Google Scholar 

  • Blanchard, R. (1997). Birth order and sibling sex ratio in homosexual versus heterosexual males and females. Ann.Rev.Sex Res. 8: 27–67.

    Google Scholar 

  • Blanchard, R., and Bogaert, A. F. (1996a). Biodemographic comparisons of homosexual and heterosexual men in the Kinsey interview data. Arch.Sex.Behav. 25: 551–579.

    PubMed  Google Scholar 

  • Blanchard, R., and Bogaert, A. F. (1996b). Homosexuality in men and number of older brothers. Am.J.Psychiat. 153: 27–31.

    PubMed  Google Scholar 

  • Blanchard, R., and Bogaert, A. F. (1998). Birth order in homosexual versus heterosexual sex offenders against children, pubescents, and adults. Arch.Sex.Behav. 27: 595–603.

    PubMed  Google Scholar 

  • Blanchard, R., and Klassen, P. (1997). H-Y antigen and homosexuality in men. J.Theor.Biol. 185: 373–378.

    PubMed  Google Scholar 

  • Blanchard, R., Watson, M. S., Choy, A., Dickey, R., Klassen, P., Kuban, M., and Ferren, D. J. (1999). Pedophiles: Mental retardation, maternal age, and sexual orientation. Arch.Sex.Behav. 28: 111–127.

    PubMed  Google Scholar 

  • Blanchard, R., Zucker, K. J., Bradley, S. J., and Hume, C. S. (1995). Birth order and sibling sex ratio in homosexual male adolescents and probably prehomosexual feminine boys. Dev.Psychol. 31: 22–30.

    Google Scholar 

  • Blanchard, R., Zucker, K. J., Siegelman, M., Dickey, R., and Klassen, P. (1998). The relation of birth order to sexual orientation in men and women. J.Biosoc.Sci. 30: 511–519.

    PubMed  Google Scholar 

  • Bogle, A. C., Reed, T., and Rose, R. J. (1994). Replication of asymmetry of a-bridge count and behavioral discordance in monozygotic twins. Behav.Genet. 24: 65–72.

    PubMed  Google Scholar 

  • Bogaert, A. F. (1998). Birth order and sibling sex ratio in homosexual and heterosexual non-white men. Arch.Sex.Behav. 27: 467–473.

    PubMed  Google Scholar 

  • Bogaert, A. F., Bezeau, S., Kuban, M., and Blanchard, R. (1997). Pedophilia, sexual orientation, and birth order. J.Abnorm.Psychol. 106: 331–335.

    PubMed  Google Scholar 

  • Chahnazarian, A. (1988). Determinants of the sex ratio at birth: Review of recent literature. Soc.Biol. 35: 214–235.

    PubMed  Google Scholar 

  • Cronk, C. E., and Reed, R. B. (1981). Canalization of growth in Down syndrome children three months to six years. Hum.Biol. 53: 383–398.

    PubMed  Google Scholar 

  • Fay, R. E., Turner, C. F., Klassen, A. D., and Gagnon, J. H. (1989). Prevalence and patterns of samegender sexual contact among men. Science 243: 338–348.

    PubMed  Google Scholar 

  • Freund, K. (1967). Diagnosing homo-or heterosexuality and erotic age-preference by means of a psychophysiological test. Behav.Res.Ther. 5: 209–228.

    PubMed  Google Scholar 

  • Freund, K., and Blanchard, R. (1987). Feminine gender identity and physical aggressiveness in heterosexual and homosexual pedophiles. J.Sex Mar.Ther. 13: 25–34.

    Google Scholar 

  • Freund, K., and Blanchard, R. (1989). Phallometric diagnosis of pedophilia. J.Consult.Clin.Psychol. 57: 100–105.

    PubMed  Google Scholar 

  • Freund, K., Heasman, G., Racansky, I. G., and Glancy, G. (1984). Pedophilia and heterosexuality vs. homosexuality. J.Sex Mar.Ther. 10: 193–200.

    Google Scholar 

  • Freund, K., Scher, H., Chan, S., and Ben-Aron, M. (1982). Experimental analysis of pedophilia. Behav.Res.Ther. 20: 105–112.

    PubMed  Google Scholar 

  • Freund, K., Scher, H., and Hucker, S. (1983). The courtship disorders. Arch.Sex.Behav. 12: 369–379.

    PubMed  Google Scholar 

  • Friedman, R. C. (1988). Male Homosexuality: A Contemporary Psychoanalytic Perspective, Yale University Press, New Haven, CT.

    Google Scholar 

  • Gebhard, P. H., Gagnon, J. H., Pomeroy, W. B., and Christenson, C. V. (1965). Sex Offenders: An Analysis of Types, Harper & Row, New York.

    Google Scholar 

  • Hare, E. H., and Price, J. S. (1969). Birth order and family size: Bias caused by changes in birth rate. Br.J.Psychiat. 115: 647–657.

    Google Scholar 

  • Hare, E. H., and Price, J. S. (1974). Birth order and birth rate bias: Findings in a representative sample of the adult population of Great Britain. J.Biosoc.Sci. 6: 139–150.

    Google Scholar 

  • Harris, G. T., Rice, M. E., Quinsey, V. L., Chaplin, T. C., and Earls, C. (1992). Maximizing the discriminant validity of phallometric assessment data. Psych.Assess. 4: 502–511.

    Google Scholar 

  • James, W. H. (1987). The human sex ratio. Part 1: A review of the literature. Hum.Biol. 59: 721–752.

    PubMed  Google Scholar 

  • James, W. H. (1998). The sex ratios of the sibs of children with psychiatric diagnoses. J.Child Psychol.Psychiat. 39: 595.

    PubMed  Google Scholar 

  • Johnson, A. M., Wadsworth, J., Wellings, K., Bradshaw, S., and Field, J. (1992). Sexual lifestyles and HIV risk. Nature360: 410–412.

    PubMed  Google Scholar 

  • Jones, M. B., and Blanchard, R. (1998). Birth order and male homosexuality: An extension of Slater's Index. Hum.Biol.70: 775–787.

    PubMed  Google Scholar 

  • Langevin, R. (1985). Introduction. In Langevin, R. (ed.), Erotic Preference, Gender Identity, and Aggression in Men: New Research Studies, Lawrence Erlbaum Associates, Hillsdale, NJ, pp. 1–13.

    Google Scholar 

  • Mohr, J.W., Turner, R. E., and Jerry, M. B. (1964). Pedophilia and Exhibitionism, University of Toronto Press, Toronto, Ontario, Canada.

    Google Scholar 

  • Paitich, D., Langevin, R., Freeman, R., Mann, K., and Handy, L. (1977). The Clarke SHQ: A clinical sex history questionnaire for males. Arch.Sex.Behav.6: 421–436.

    PubMed  Google Scholar 

  • Prader, A., Tanner, J. M., and von Harnack, G. A. (1963). Catch-up growth following illness or starvation: An example of developmental canalization in man. J.Pediatr.62: 646–659.

    PubMed  Google Scholar 

  • Price, J. S., and Hare, E. H. (1969). Birth order studies: Some sources of bias. Br.J.Psychiat.115: 633–646.

    Google Scholar 

  • Purcell, D. W., Blanchard, R., and Zucker, K. J. (in press). Birth order in a contemporary sample of gay men. Arch.Sex.Behav.

  • Raymond, N. C., Coleman, E., Ohlerking, F., Christenson, G. A., and Miner, M. (1999). Psychiatric comorbidity in pedophilic sex offenders. Am.J.Psychiat.156: 786–788.

    PubMed  Google Scholar 

  • Rooth, G. (1973). Exhibitionism, sexual violence and paedophilia. Br.J.Psychiat.122: 705–710.

    Google Scholar 

  • Rose, R. J., Reed, T., and Bogle, A. (1987). Asymmetry of a-bridge count and behavioral discordance of monozygotic twins. Behav.Genet.17: 125–140.

    PubMed  Google Scholar 

  • Shapiro, B. L. (1975). Amplified developmental instability in Down's syndrome. Ann.Hum.Genet.38: 429–437.

    PubMed  Google Scholar 

  • Spitzer, R. L. (1981). The diagnostic status of homosexuality in DSM-III:Areformulation of the issues. Am.J.Psychiat.138: 210–215.

    PubMed  Google Scholar 

  • Sulloway, F. J. (1996). Born to Rebel: Birth Order, Family Dynamics, and Creative Lives, Pantheon Books, New York.

    Google Scholar 

  • Waddington, C. H. (1962). New Patterns in Genetics and Development, Columbia University Press, New York.

    Google Scholar 

  • Wilkins, A. S. (1997). Canalization: A molecular genetic perspective. BioEssays19: 257–262.

    PubMed  Google Scholar 

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Blanchard, R., Barbaree, H.E., Bogaert, A.F. et al. Fraternal Birth Order and Sexual Orientation in Pedophiles. Arch Sex Behav 29, 463–478 (2000). https://doi.org/10.1023/A:1001943719964

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