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RE: Race and IQ, The Alt-Right, and the Post-Racial future of humaity
This column and the paper on which it is based goes into more detail about how epigenetics (testosterone exposure in the womb) might explain differences in sexuality between twins.
http://www.intergalacticmedicineshow.com/cgi-bin/mag.cgi?do=columns&vol=randall_hayes&article=010