Throughout history, and cross-culture there is more than enough evidence that transsexualism is nothing more than natural-variance. And it comes across to me, that the way a culture handles this natural occurring phenomenon is proportional to that cultures closeness to nature.
There is a genetic male (XY) and a genetic female (XX). Until the sixth week of pregnancy they are exactly the same biologically. The biological man is created when the Y gives the signal to differentiate the sexual glands into testicles and start testosterone production with a bang.
In girls this simply doesn't happen. This means that if trough some defect on the Y gene the signal "testicles now" isn't given the boy comes out as a female lacking ovaries. (jamie lee curtis).
So female is the biological default. Male is an aberration. With the first testosteron surge the brain gets differentiated. The male brain gets a burn in the communicative cortex and gets a plus in aggression and sex areas. This is done with hormones, and this process is not perfect.
So a transsexual can be a genetic male and biologically man but with a non differentiated female brain. Now the brain interprets the body as a mismatch.
I hope this explains it.
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