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A common argument is that an inclination to homosexuality is inborn and immutable. It is widely believed that the public will become more accepting of homosexuality if they are convinced that it is inborn and immutable.  For example, [[Neuroscience|neuroscientist]] and homosexual Simon Levay stated: "...people who think that gays and lesbians are born that way are also more likely to support gay rights."<ref>[http://www.truenews.org/Homosexuality/homosexual_myths_and_facts.html Myths and facts about homosexuality]</ref>

A common argument is that an inclination to homosexuality is inborn and immutable. It is widely believed that the public will become more accepting of homosexuality if they are convinced that it is inborn and immutable.  For example, [[Neuroscience|neuroscientist]] and homosexual Simon Levay stated: "...people who think that gays and lesbians are born that way are also more likely to support gay rights."<ref>[http://www.truenews.org/Homosexuality/homosexual_myths_and_facts.html Myths and facts about homosexuality]</ref>

[[Causes of Homosexuality|Research into the issue of the origins of homosexuality]] suggests that adoptive brothers are more likely to both be homosexuals than the biological brothers, who share half their [[gene]]s which suggests that homosexuality is not genetically caused. <ref>(''Science'', Vol. 262, page 2063, December 24, 1993)</ref><ref>http://www.trueorigin.org/gaygene01.asp</ref> This data prompted the journal ''Science'' to report "this . . . suggests that there is no genetic component, but rather an environmental component shared in families".<ref>(''Science'', Vol. 262, page 2063, December 24, 1993)</ref><ref>http://www.trueorigin.org/gaygene01.asp</ref> However, in regards to [[psychosocial]] and biological theories in regards to the origin of homosexuality, [[Columbia University]] [[psychiatry]] professors Drs. William Byrne and Bruce Parsons stated in 1994: "There is no evidence that at present to substantiate a [[biology|biological]] theory. [T]he appeal of current biological explanations for sexual orientation may derive more from dissatisfaction with the present status of psychosocial explanations than from a substantiating body of experimental data".<ref>http://www.cwfa.org/images/content/bornorbred.pdf</ref>

Eight major studies of identical twins in the United States, Australia and Scandinavia during the last two decades indicate that homosexuals were not born that way.<ref>[http://www.orthodoxytoday.org/blog/2013/06/identical-twin-studies-prove-homosexuality-is-not-genetic/ Identical Twin Studies Prove Homosexuality is Not Genetic]</ref> [[Causes of Homosexuality|Research into the issue of the origins of homosexuality]] suggests that adoptive brothers are more likely to both be homosexuals than the biological brothers, who share half their [[gene]]s which suggests that homosexuality is not genetically caused. <ref>(''Science'', Vol. 262, page 2063, December 24, 1993)</ref><ref>http://www.trueorigin.org/gaygene01.asp</ref> This data prompted the journal ''Science'' to report "this . . . suggests that there is no genetic component, but rather an environmental component shared in families".<ref>(''Science'', Vol. 262, page 2063, December 24, 1993)</ref><ref>http://www.trueorigin.org/gaygene01.asp</ref> However, in regards to [[psychosocial]] and biological theories in regards to the origin of homosexuality, [[Columbia University]] [[psychiatry]] professors Drs. William Byrne and Bruce Parsons stated in 1994: "There is no evidence that at present to substantiate a [[biology|biological]] theory. [T]he appeal of current biological explanations for sexual orientation may derive more from dissatisfaction with the present status of psychosocial explanations than from a substantiating body of experimental data".<ref>http://www.cwfa.org/images/content/bornorbred.pdf</ref>

Dr. Tahir I. Jaz, M.D., Winnipeg, Canada states: "The increasing claims of being "[[Homosexuality and Genetics|born that way]]" parallels the rising political activism of homosexual organizations, who politicize the issue of homosexual origins. In the 1970s, approximately ten percent of homosexuals claimed to be "born homosexual" according to a large scale survey....However, in a survey in the 1980s, with the homosexual rights movement increasingly becoming active, thirty-five percent claimed to be born that way.<ref>http://www.flyfishingdevon.co.uk/salmon/year2/hormones/tahir.htm</ref>

Dr. Tahir I. Jaz, M.D., Winnipeg, Canada states: "The increasing claims of being "[[Homosexuality and Genetics|born that way]]" parallels the rising political activism of homosexual organizations, who politicize the issue of homosexual origins. In the 1970s, approximately ten percent of homosexuals claimed to be "born homosexual" according to a large scale survey....However, in a survey in the 1980s, with the homosexual rights movement increasingly becoming active, thirty-five percent claimed to be born that way.<ref>http://www.flyfishingdevon.co.uk/salmon/year2/hormones/tahir.htm</ref>