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Penises Are Shaped To Pull Other Guy's Sperm Out Of The Vagina. Think about evolutionary biology for a minute. Survival of the fittest, right? Your penis knows this, and that shape helps you cancel out women's natural instinct towards promiscuity (it's science, look it up.) The penis' shape creates a slight suction within the vagina, meant to pull other men's semen back out of there. The shape also works like a shovel, making room for your seed.
