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11. There's A Very Good Reason For The Shape Of Penises
Ready for this one? The reason the penis has that mushroom-looking head, clinically known as the glans, is because back in the day — like way, way back in the day — the head could scoop out competitive semen from a woman during sex. Meaning, if a woman had sex with one man, then had sex with another man, the penis of the second man could remove the competing sperm to ensure his sperm would be in the lead for making a baby. 

See? I told you I was going to blow your mind.