http://en.wikipedia.org/wiki/Causes_of_ ... d_theories references Causes of transsexualism en.wikipedia.org/wiki/Causes_of_transsexualism https://en.wikipedia.org... yep http://en.wikipedia.org/wiki/Causes_of_ ... d_theories https://en.wikipedia.org... 2 Biological-based theories 2 Biological-based theories Wikipedia echos what Sapolsky says brain scans Psychological and behavioral theories this sort of thing https://en.wikipedia.org... https://en.wikipedia.org... Psychological and behavioral theories https://en.wikipedia.org... Psychological and behavioral theories http://en.wikipedia.org/wiki/Causes_of_transsexualism yep wiki has a surprisingly good summary https://en.wikipedia.org... https://en.wikipedia.org/wiki/Causes_of_transsexualism Causes of transsexualism apparent biological correlates of transgender en.wikipedia.org/wiki/Causes_of_transsexualism 2 Biological-based theories http://en.wikipedia.org/wiki/Causes_of_transsexualism