http://www.sciencedaily.com/releases/2013/10/131002131440.htm
Oct. 2, 2013 — Transgendered androphilic males were accepted in traditional hunter-gatherer cultures because they were an extra set of hands to support their families. Conversely, by investing in and supporting their kin, these males ensured that their familial line -- and therefore also their own genetic make-up -- passed on to future generations despite their not having children of their own. This is according to an ethnographic study led by Doug VanderLaan of the Centre for Addiction and Mental Health in Canada, published in Springer's journal Human Nature. The study reports that this "kin selection" is still at play in pro-transgender societies today.
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