J Korean Neuropsychiatr Assoc.  2014 May;53(3):186-190.

Research on the Etiology of Pedophilia through Monozygotic Twins with Pedophilia : A Case Report

• Shim G
• Lee JW
• Lee T
• Lee Y
• Lee J

Abstract

Recent studies have suggested an association of genetic and neurodevelopmental factors with development of paraphilia. In this case report on monozygotic twins with pedophilia, we aim to offer additional evidence indicating that genetic vulnerability may be a significant risk factor along with environmental influences on development of pedophilia. These twin pairs, who have been arrested for sexual offenses against boys, had experienced emotional and physical abuse during their childhood, and the older twin brother is reported to have a history of sexual abuse. Both showed homosexual tendencies, and the younger twin brother was also diagnosed as exhibitionism. This case implies greater involvement of genetic factors and associated vulnerabilities in the etiology of paraphilia, including pedophilia, than environmental factors such as childhood abuse. In the future, conduct of research will be needed in order to determine the biological markers related to the etiology of pedophilia.

Keyword

Pedophilia; Paraphilia; Monozygotic twin; Sex offense

MeSH Terms

Biomarkers
Exhibitionism
Homosexuality
Humans
Paraphilic Disorders
Pedophilia*
Risk Factors
Sex Offenses
Siblings
Twins, Monozygotic*

Reference

1. American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th ed. Arlington, VA: American Psychiatric Publishing;2013.

2. Seto MC. Pedophilia: psychopathology and theory. In : Richard Laws D, O'Donohue WT, editors. Sexual Deviance Theory, Assessment, and Treatment. 2nd ed. New York: The Guilford Press;2008. p. 164–182.

3. Marshall WL, Barbaree HE, Eccles A. Early onset and deviant sexuality in child molesters. J Interpers Violence. 1991; 6:323–335.

4. Abel GG, Becker JV, Cunningham-Rathner J, Mittelman M, Rouleau JL. Multiple paraphilic diagnoses among sex offenders. Bull Am Acad Psychiatry Law. 1988; 16:153–168.

5. Hall GC. Sexual offender recidivism revisited: a meta-analysis of recent treatment studies. J Consult Clin Psychol. 1995; 63:802–809.

6. Hanson RK, Gordon A, Harris AJ, Marques JK, Murphy W, Quinsey VL, et al. First report of the collaborative outcome data project on the effectiveness of psychological treatment for sex offenders. Sex Abuse. 2002; 14:169–194. discussion 195-197.

7. Marques JK, Wiederanders M, Day DM, Nelson C, van Ommeren A. Effects of a relapse prevention program on sexual recidivism: final results from California's sex offender treatment and evaluation project (SOTEP). Sex Abuse. 2005; 17:79–107.

8. Song YM, Lee D, Lee MK, Lee K, Lee HJ, Hong EJ, et al. Validity of the zygosity questionnaire and characteristics of zygosity-misdiagnosed twin pairs in the Healthy Twin Study of Korea. Twin Res Hum Genet. 2010; 13:223–230.

9. Abel GG, Harlow N. The Stop Child Molestation Book: What Ordinary People Can Do In Their Everyday Lives To Save 3 Million Children. Philadelphia, PA: Xlibris;2001.

10. Blanchard R, Barbaree HE, Bogaert AF, Dickey R, Klassen P, Kuban ME, et al. Fraternal birth order and sexual orientation in pedophiles. Arch Sex Behav. 2000; 29:463–478.

11. Blanchard R, Watson MS, Choy A, Dickey R, Klassen P, Kuban M, et al. Pedophiles: mental retardation, maternal age, and sexual orientation. Arch Sex Behav. 1999; 28:111–127.

12. Waddington CH. New Patterns in Genetics and Development. New York: Columbia University Press;1962.

13. Wilkins AS. Canalization: a molecular genetic perspective. Bioessays. 1997; 19:257–262.

14. Marshall WL, Barbaree HE. An integrated theory of the etiology of sexual offending. In : Marshall WL, Laws DR, Barbaree HE, editors. Handbook of sexual assault: Issues, theories, and treatment of the offender. New York: Plenum Press;1990. p. 257–279.

15. Lee JK, Jackson HJ, Pattison P, Ward T. Developmental risk factors for sexual offending. Child Abuse Negl. 2002; 26:73–92.

16. Bagley C, Wood M, Young L. Victim to abuser: mental health and behavioral sequels of child sexual abuse in a community survey of young adult males. Child Abuse Negl. 1994; 18:683–697.

17. Ward T, Polaschek D, Beech AR. Theories of Sexual Offending. Chichester: John Wiley & Sons;2006.

18. Swaab DF. Sexual differentiation of the brain and behavior. Best Pract Res Clin Endocrinol Metab. 2007; 21:431–444.

19. Swaab DF. The human hypothalamus: basic and clinical aspects. Part II: neuropathy of the human hypothalamus and adjacent brain structures. In : Aminoff MJ, Boller F, Swaab DF, editors. Handbook of clinical neurology. Amsterdam: Elsevier;2004. p. 1–596.

20. Zhou JN, Hofman MA, Gooren LJ, Swaab DF. A sex difference in the human brain and its relation to transsexuality. Nature. 1995; 378:68–70.

21. Kruijver FP, Zhou JN, Pool CW, Hofman MA, Gooren LJ, Swaab DF. Male-to-female transsexuals have female neuron numbers in a limbic nucleus. J Clin Endocrinol Metab. 2000; 85:2034–2041.

22. Cantor JM, Blanchard R, Christensen BK, Dickey R, Klassen PE, Beckstead AL, et al. Intelligence, memory, and handedness in pedophilia. Neuropsychology. 2004; 18:3–14.

23. Cantor JM, Klassen PE, Dickey R, Christensen BK, Kuban ME, Blak T, et al. Handedness in pedophilia and hebephilia. Arch Sex Behav. 2005; 34:447–459.

24. Blanchard R, Kuban ME, Klassen P, Dickey R, Christensen BK, Cantor JM, et al. Self-reported head injuries before and after age 13 in pedophilic and nonpedophilic men referred for clinical assessment. Arch Sex Behav. 2003; 32:573–581.

25. Cantor JM, Blanchard R, Robichaud LK, Christensen BK. Quantitative reanalysis of aggregate data on IQ in sexual offenders. Psychol Bull. 2005; 131:555–568.

26. Plomin R, Spinath FM. Intelligence: genetics, genes, and genomics. J Pers Soc Psychol. 2004; 86:112–129.

27. Kim HK. Norm for three-factor interpretation of K-WAIS profile. Korean J Clin Psychol. 2002; 21:631–645.

28. DeWolfe AS, Ryan JJ. Wechsler performance IQ greater than Verbal IQ index in a forensic sample: a reconsideration. J Clin Psychol. 1984; 40:291–294.

29. Hall GC. WAIS-R and MMPI profiles of men who have sexually assaulted children: evidence of limited utility. J Pers Assess. 1989; 53:404–412.

30. Seto MC. Pedophilia and Sexual Offending Against Children: Theory, Assessment, and Intervention. Washington, DC: Amer Psychological Association;2007.

31. Långström N, Grann M, Lichtenstein P. Genetic and environmental influences on problematic masturbatory behavior in children: a study of same-sex twins. Arch Sex Behav. 2002; 31:343–350.

32. Alanko K, Salo B, Mokros A, Santtila P. Evidence for heritability of adult men's sexual interest in youth under age 16 from a population-based extended twin design. J Sex Med. 2013; 10:1090–1099.

33. Gaffney GR, Lurie SF, Berlin FS. Is there familial transmission of pedophilia? J Nerv Ment Dis. 1984; 172:546–548.

34. Labelle A, Bourget D, Bradford JM, Alda M, Tessier P. Familial paraphilia: a pilot study with the construction of genograms. ISRN Psychiatry. 2012; 2012:692813.