Talk:Homosexual transsexual/proposed subsection

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Research on the causes of homosexual transsexualism, transsexualism, and homosexuality overlap to a large degree. The article Etiology of transsexualism covers the general etiology of transsexualism. Research specifically related to "homosexual transsexuals" leads to the conclusion that birth order has some influence over sexual orientation in biological males.^{[1][2] [3]} This phenomena is called the "fraternal birth order effect".^[2] Richard Green found "Homosexual male-to-female transsexuals have a later than expected birth order and more older brothers than other subgroups of male-to-female transsexuals. Each older brother increases the odds that a male transsexual is homosexual by 40%."^[3] Notably Green did not find a higher incidence of homosexuality in the younger brothers of homosexual transsexuals. In a more recent study of homosexual transsexual males in Korea Kenneth Zucker found no older brother effect.^[2] Zucker attributes this to the preference for males in Korean society causing parents to stop having children once they have a boy. ^[2] Therefore all male children are less likely to have older brothers and hence no fraternal birth order effect. ^[2]

According to Dr. Bailey's interpretation of Blanchard's theory in any case the cause of homosexual transsexuality is an extremeum of the cause of homosexuality in males. Reseach that has been done to date on the fraternal birth order effect bears this out. homosexual transsexuals for who have older brothers are born latter overall, and latter in a series of brothers.