Why did humans evolve big penises but small testicles?

We have the penis of a monogamous primate yet our body sizes suggest our ancestors slept around a lot.

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Why Did Humans Evolve Big Penises But Small Testicles?

Is the human male's penis size being bigger than other primates an evolutionary thing? : r/evolution

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Why did humans evolve big penises but small testicles?

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