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Most people are not aware that penises usually have bones. Most mammals have a penis bone, called a baculum. The reason most people don't know this is because humans are weirdos in the animal kingdom and do NOT have a baculum.

Even though most primates have a baculum, humans don't have one. This has puzzled biologists for years, and tons of theories abound as to why humans lost their dick bones. But we're a Vagina Museum, we're not interested in *that*.