Twin Studies and Homosexuality 7-11-2015 by Paul Giem
Channel: ItIsAboutGod
Date: 2015-07-12

Last week the claim was made that 8 twin studies supported the idea that homosexuality was not primarily genetic or determined in utero. An attempt is made to track down the evidence behind that claim and to look briefly at some other twin studies.

1. Bailey, M. et al. 2000. In Genetic and Environmental Influences on Sexual Orientation and Its Correlates in an Australian Twin Samples. J Pers Soc Psychol 78:524-536. Available at http://postcog.ucd.ie/files/Bailey%20et%20al.%20twins,2000.pdf
2. Bearman, P. & H. Bruckner. 2002. Opposite Sex Twins and Adolescent Same-Sex Attraction. Am J Sociology 107(5):1179-1205. Available at http://academiccommons.columbia.edu/catalog/ac:129241 
3. http://religiopoliticaltalk.com/rpts-cumulative-case-why-same-sex-relationships-should-not-be-normalized/
4. Whitehead, N. E. 2014. My genes made me do it! Homosexuality and the Scientific Evidence. 3rd ed. Huntington House Publishers, Lafayette, LA. Available at http://mygenes.co.nz/download.htm - Chapter 10 (Twin studies — the strongest evidence) available at http://mygenes.co.nz/PDFs/Ch10.pdf
5. Jones, S. L. & M. A. Yarhouse. 2000. Homosexuality: The Use of Scientific Research in the Church's Moral Debate. Downer’s Grove, IL: InterVarsity Press. Not examined in this study, but synopsis used. Available at http://www.cccu.org/~/media/filefolder/2005-2007/Jones-Homosexuality_pdf.pdf
6. Bailey, J. M. & R. C. Pillard. 1991. A genetic study of male sexual orientation. Arch Gen Psychiatry, 48:1081-1096. Available at https://www.researchgate.net/profile/J_Bailey2/publication/21311211_A_genetic_study_of_male_sexual_orientation/links/02e7e53c1a72a8a596000000.pdf
7. Bailey, J. M., R. C. Pillard, M. C. Neale, & Y. Agyei. 1993. Heritable factors influence sexual orientation in women. Archives of General Psychiatry 50:217-223. Available at http://faculty.bennington.edu/~sherman/sex/female-twin-lesbian.pdf
8. Kirk, K. M., J. M. Bailey, M. P. Dunne, & N. G. Martin. 2000. Measurement models for sexual orientation in a community twin sample. Behavior Genetics 30:345-56. Available at https://genepi.qimr.edu.au/contents/p/staff/CV279.pdf
9. Buhrich, N., J. M. Bailey, & N. G. Martin. 1991. Sexual orientation, sexual identity, and sex-dimorphic behaviors in male twins. Behavior Genetics 21:75-96. Abstract available at http://link.springer.com/article/10.1007/BF01067668#page-1
10. Hershberger, S. L. 1997. A twin registry study of male and female sexual orientation. Journal of Sex Research 34:212-22. Abstract (and first page) available at http://www.tandfonline.com/doi/abs/10.1080/00224499709551886#preview
11. Santtila, P., N. K. Sandnabba, N. Harlaar, M. Varjonen, K. Alanko, & B. von der Pahlen. 2008. Potential for homosexual response is prevalent and genetic. Biological Psychology 77(1):102-5. Abstract available at http://www.sciencedirect.com/science/article/pii/S0301051107001433
12. Langstrom, N., Q. Rahman, E. Carlstrom, & P. Lichtenstein. 2010. Genetic and Environmental Effects on Same-sex Sexual Behavior: A Population Study of Twins in Sweden. Arch Sexual Behavior 39(1):75-80. Available at http://www.behavioralneuroscience.org/neurogenetics_files/Långström%20et%20al.%20-%202010%20-%20Archives%20of%20sexual%20behavior.pdf
13. Alanko, K., P. Santtila, N. Harlaar, K. Witting, K. Varjonen, P. Jern, A. Johansson, B. von der Pahlen, & N. K. Sandnabba. 2010. Common Genetic Effects of Gender Atypical Behavior in Childhood and Sexual Orientation in Adulthood: A Study of Finnish Twins. Arch Sexual Behavior 39(1):81-92. Available at https://www.researchgate.net/profile/Patrick_Jern/publication/23951519_Common_genetic_effects_of_gender_atypical_behavior_in_childhood_and_sexual_orientation_in_adulthood_a_study_of_Finnish_twins/links/54fd9f060cf270426d12c64b.pdf
14. Bailey, J. M. & A. P. Bell. 1993. Familiality of female and male homosexuality. Behavior Genetics. 23: 313-322. Available at http://link.springer.com/article/10.1007/BF01067431
15. Kirk, K. M. & J. M. Bailey. 2000. Etiology of male sexual orientation in an Australian twin sample. Psychology, Evolution & Gender. 2(3): 301-311. Available at https://genepi.qimr.edu.au/contents/publications/staff/CV284.pdf
16. Alanko, K., B. Salo, A. Mokros, & P. Santilla. 2013. Evidence for Heritability of Adult Men's Sexual Interest in Youth under Age 16 from a Population-Based Extended Twin Design. J Sex Med 10(4):[No pages listed]. Available at https://www.researchgate.net/publication/235369954_Evidence_for_Heritability_of_Adult_Men%27s_Sexual_Interest_in_Youth_under_Age_16_from_a_Population-Based_Extended_Twin_Design
17. http://www.councilforresponsiblegenetics.org/ViewPage.aspx?pageId=74#IIC

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