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Not BORN or STUCK With It!

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8 + World-Wide Med. J. Studies


Perfect Test Case: Identical Twin Co-Twins


**Same DNA, Same Genes, Same Biology**


11% or less MALE     Co-Twins: Gay


14% or less FEMALE Co-Twins: Gay


Not 99%!


Large Objective Studies,


no Volunteer or Selection Bias!


Identical Twin Studies Not Born With It


Reference Medical Journal Studies


From PubMed.gov

1 Bailey JM, Dunne MP, Martin NG. 2000. Genetic and Environmental


influences on sexual orientation and its correlates in an Australian twin


sample. Journal of Personality and Social Psychology 78:524-36



2. Hershberger SL. 1997. A twin registry study of male and female sexual


orientation. Journal of Sex Research 34:212-22



3. Santtila P, Sandnabba NK, Harlaar N, Varjonen M, Alanko K, von der


Pahlen B.2008. Potential for homosexual response is prevalent and


genetic. Biological Psychology 77(1):102-5



4. Langstrom N, Rahman Q, Carlstrom E, Lichtenstein P. 2010. Genetic


and Environmental Effects on Same-sex Sexual Behavior: A Population


Study of Twins in Sweden. Archives of Sexual Behavior 39(1):75-80 (SSA


concordance between MZ twins was only 11% for males and 14%


for females)

5 Alanko K, Santtila P, Harlaar N, Witting K, Varjonen K, Jern P, Johansson


A, von der Pahlen B, Sandnabba NK. 2010. Common Genetic Effects of


Gender Atypical Behavior in Childhood and Sexual Orientation in


Adulthood: A Study of Finnish Twins. Archives of Sexual Behavior


39(1):81-92

6. Buhrich N, Bailey JM, Martin NG. 1991. Sexual orientation, sexual


identity, and sex-dimorphic behaviors in male twins. Behavior Genetics


21:75-96

7. Kendler KS1, Thornton LM, Gilman SE, Kessler RC.2000. Sexual


orientation in a U.S. national sample of twin and nontwin sibling pairs. Am


J Psychiatry. 2000 Nov;157(11):1843-1846.

8. Burri A, Spector T, Rahman Q. 2015. Common Genetic Factors among


Sexual Orientation, Gender Nonconformity, and Number of Sex Partners


in Female Twins: Implications for the Evolution of Homosexuality. J Sex


Med. 2015 Apr;12(4):1004-11. doi: 10.1111/jsm.12847. Epub 2015 Feb


25.

9. Zietsch BP, Verweij KJ, Heath AC, Madden PA, Martin NG, Nelson EC,


Lynskey MT. 2012.         Do shared etiological factors contribute to the


relationship between sexual orientation and depression? Psychol Med.


2012 Mar;42(3):521-32.

10 Bearman PS, Brueckner H. 2002. Opposite-sex twins and adolescent


same-sex attraction. American Journal of Sociology 107:1179-205 (SSA


concordance between MZ twins was only 7.7% for males and 5.3%


for females)

11. Kirk KM, Bailey JM, Dunne MP, Martin NG. 2000. Measurement


models for sexual orientation in a community twin sample. Behavior


Genetics 30:345-56 (SSA concordance between MZ twins was only 11


% for males and 14% for females)

12, Whitehouse, Neil. E. 2013. MY GENES MADE ME DO IT!


Homosexuality and the Scientific Evidence. 3rd Edition at:



http://www.mygenes.co.nz/download.htm


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