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''For more information please see:'' [[Genetics, Homosexuality, Evolutionary Paradigm, and Creation Science]] and [[Homosexuality and Genetics]].

''For more information please see:'' [[Genetics, Homosexuality, Evolutionary Paradigm, and Creation Science]] and [[Homosexuality and Genetics]].

Concerning any possible biological causes of homosexuality, the idea that homosexuality has a biological cause can be traced back to the preliminary findings of neuroscientist Dr. Simon LeVay in 1991. LeVay's studied the brains of 41 cadavers, which included 19 homosexual males, and claimed that "a tiny area believed to control sexual activity [the hypothalamus] was less than half the size in the gay men than in the heterosexuals."<ref>Charlene Crabb, ''Are Some Men Born to Be Homosexual?'', U. S. News & World Report, 9 September 1991, p. 58</ref><ref>S. LeVay, "A Difference in Hypothalamic Structure Between heterosexual and Homosexual Men," Science 253 (1991), pp. 1034-37</ref>  This study was immediately seized upon by many as  proof that homosexuality was biologically determined.  

The belief that homosexuality has a biological cause can be traced back to the preliminary findings of neuroscientist Dr. Simon LeVay. In 1991 LeVay's studied the brains of 41 cadavers which included 19 homosexual males, and claimed that "a tiny area believed to control sexual activity [the hypothalamus] was less than half the size in the gay men than in the heterosexuals."<ref>Charlene Crabb, ''Are Some Men Born to Be Homosexual?'', U. S. News & World Report, 9 September 1991, p. 58</ref><ref>S. LeVay, "A Difference in Hypothalamic Structure Between heterosexual and Homosexual Men," Science 253 (1991), pp. 1034-37</ref>  This study was immediately seized upon by many as  proof that homosexuality was biologically determined.  

However, further scrutiny showed their hasty conclusions a critically lacking warrant.  

However, further scrutiny showed this hasty conclusion as lacking in warrant.  

*1.  The range of sizes of the hypothalamic region varied and was inconsistent. The region at subject was the same size in a few homosexual men as that of the heterosexuals, while in a few other heterosexuals this region was a small as that of a homosexual.  

*1.  The range of sizes of the hypothalamic region varied and was inconsistent. The region at subject was the same size in a few homosexual men as that of the heterosexuals, while in a few other heterosexuals this region was a small as that of a homosexual.  

*5. The conclusions were that which were sought by the researcher. Dr. LeVay, a homosexual himself, confessed that his study was not entirely a dispassionate scientific endeavor,<ref>Simon LeVay on The Phil Donahue Show, ''Genetically Gay: Born Gay or Become Gay?'', January 3, 1992</ref> He also later stated, "I did not prove that homosexuality is genetic, or find a genetic cause for being gay."<ref>Byrd, A. Dean, Shirley E. Cox, and Jeffrey W. Robinson (2001), ''Homosexuality: The Innate-Immutability Argument Finds No Basis in Science'', The Salt Lake Tribune</ref><ref>http://www.sltrib.com/2001/may/05272001/commenta/100523.htm</ref>

*5. The conclusions were that which were sought by the researcher. Dr. LeVay, a homosexual himself, confessed that his study was not entirely a dispassionate scientific endeavor,<ref>Simon LeVay on The Phil Donahue Show, ''Genetically Gay: Born Gay or Become Gay?'', January 3, 1992</ref> He also later stated, "I did not prove that homosexuality is genetic, or find a genetic cause for being gay."<ref>Byrd, A. Dean, Shirley E. Cox, and Jeffrey W. Robinson (2001), ''Homosexuality: The Innate-Immutability Argument Finds No Basis in Science'', The Salt Lake Tribune</ref><ref>http://www.sltrib.com/2001/may/05272001/commenta/100523.htm</ref>

Two prominent geneticists, Paul Billings and Jonathan Beckwith, commenting on the quality of the LeVay research, stated that, LeVay "could not really be certain about his subject's sexual preferences, since they were dead." and that his "research design and subject sample did not allow others to determine whether it was sexual behavior, drug use, or disease history that was correlated with the observed differences among the subjects' brains."  And in addition, it was very likely that LeVay's method of defining homosexuality would "create inaccurate or inconsistent study groups." <ref>P. Billings and J. Beckwith, "Born Gay?" Technology Review, July 1993, p. 60,61</ref>

Two prominent geneticists, Paul Billings and Jonathan Beckwith, commenting on the quality of the LeVay research, stated that  LeVay, "could not really be certain about his subject's sexual preferences, since they were dead." and that his "research design and subject sample did not allow others to determine whether it was sexual behavior, drug use, or disease history that was correlated with the observed differences among the subjects' brains."  And in addition, it was very likely that LeVay's method of defining homosexuality would "create inaccurate or inconsistent study groups." <ref>P. Billings and J. Beckwith, "Born Gay?" Technology Review, July 1993, p. 60,61</ref>

Another study, published in ''Proceedings of the National Academy of Science of the United States of America'', examined the ''anterior commissure'' (a structure that divides the left and right halves of the brain) of male heterosexuals and homosexual men, most of whom died of AIDS. The study shows that the anterior commissure was larger in women and in 27 of the 30 homosexual men than in heterosexual men.<ref>L. Allen, et al., ''Sexual Orientation and the Size of the Anterior Commissure in the Human Brain,'' Proceedings of the National Academy of Science of the United States of America 89, no. 15 (1992), pp. 7199-7202</ref>.   

Another study, published in ''Proceedings of the National Academy of Science of the United States of America'', examined the ''anterior commissure'' (a structure that divides the left and right halves of the brain) of male heterosexuals and homosexual men, most of whom died of AIDS. The study shows that the anterior commissure was larger in women and in 27 of the 30 homosexual men than in heterosexual men.<ref>L. Allen, et al., ''Sexual Orientation and the Size of the Anterior Commissure in the Human Brain,'' Proceedings of the National Academy of Science of the United States of America 89, no. 15 (1992), pp. 7199-7202</ref>.   

Here again, how AIDS might have factored in this difference is an issue, and the findings of this study were overall in contradiction to another study published in 1988, which  found, in part, that the anterior commissure was larger in men than in women.<ref>S. Demeter et al., "Morphometric analysis of the human corpus callosum and anterior commissure," Human Neurobiology 6 1988), pp. 219-26</ref>  

Here again, how AIDS might have factored in this difference is an issue, and the findings of this study were overall in contradiction to another study published in 1988, which  found, in part, that the anterior commissure was larger in men than in women.<ref>S. Demeter et al., "Morphometric analysis of the human corpus callosum and anterior commissure," Human Neurobiology 6 1988), pp. 219-26</ref>  

A 1991 study of twins by  Michael Bailey and Richard Pillard was also promoted as evidencing biological determination of homosexuality, but which conclusion was soon found to be lacking in warrant, and contrary to other studies.<ref>http://www.leaderu.com/orgs/probe/docs/homotheo.html</ref><ref>[http://www.biblebelievers.com/Cameron4.html  Dr. Paul Cameron, ''Born WHAT Way?'']</ref>  

A 1991 study of twins by  Michael Bailey and Richard Pillard was also promoted as establishing biological determination of homosexuality, but which conclusion was also soon found to be lacking in warrant, and contrary to other studies.<ref>http://www.leaderu.com/orgs/probe/docs/homotheo.html</ref><ref>[http://www.biblebelievers.com/Cameron4.html  Dr. Paul Cameron, ''Born WHAT Way?'']</ref>  

That blood chemistry as well as brains can change over time in response to environment and lifestyle has been documented by studies.<ref>http://www.leaderu.com/orgs/narth/bioresearch.html</ref><ref>Dr. Jeffrey Satinover, ''The Biology of Homosexuality: Science or Politics?''</ref><ref>http://www.leaderu.com/orgs/narth/bioresearch.html</ref>

That blood chemistry as well as brains can change over time in response to environment and lifestyle has been documented by studies.<ref>http://www.leaderu.com/orgs/narth/bioresearch.html</ref><ref>Dr. Jeffrey Satinover, ''The Biology of Homosexuality: Science or Politics?''</ref><ref>http://www.leaderu.com/orgs/narth/bioresearch.html</ref>