The "Sin of Onan" is widespread in the animal kingdom, but at least some species have good reproductive reasons to fondle themselves. https://www.amazon.com/Book-Humans-Story-How-Became-ebook/dp/B07C2DPRZR/ref=sr_1_2?s=digital-text&ie=UTF8&qid=1546787474&sr=1-2&keywords=the+book+of+humans …pic.twitter.com/h1tsZeTugt
7:12 AM - 6 Jan 2019
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