Many species, including some of our closest primate relatives, have penis bones. Why don’t we?
Two-Foot Penis Bones: How Walruses Stay Erect In Freezing Water - https://youtu.be/QCbgT2LS4sQ
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Why humans lost their penis bone
http://www.sciencemag.org/news/2016/12/why-humans-lost-their-penis-bone
“Despite slang terms that imply otherwise, the human penis contains n
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