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The gist of what you wrote is correct. However, it is not X-inactivation that causes one to have a male phenotype. The default plan, in the absence of a Y chromosome is female. Genes on the Y...

Interesting video. I am a big fan of the neurosciences.

I would like to hear deeper theories or proposed mechanisms behind this all. I can see men being attracted to breasts, butts, and feet (as...