Quote Originally Posted by Schatten Lupus
There is most definitely a genetic cause as it has been noted that the brains of a transsexual developed more like the brains of the sex they identified as, rather than the sex of their birth.
I guess you are refering to the 1995 study by Zhou, Hofman, Gooren, and Swaab which dissected the brains of six post-op MTF transsexuals and found their structure to be more in line with females than males. You are aware of the serious flaw in this study? Aside from the tiny number of subjects, all the transsexuals had been on hormones for a long time. Since we know hormones dictate male and female brain structures, the result was predictable. Only by disscting transsexual brains who never took hormones would you be able to discern if there was a genetic causation. And unless the person has a hormonal imbalance a MTF transsexual's brain is only exposed to testosterone from the day they are born until the day they begin hormone treatment.