Why did humans evolve big penises but small testicles?

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

i.guim.co.uk/img/static/sys-images/Guardian/Pix/pi

Why do mammals have two testicles? When did it start on evolutionary history? - Quora

Science - Gayety

Human evolution – News, Research and Analysis – The Conversation – page 7

Penis evolution across species: divergence and diversity

Penis evolution across species: divergence and diversity

How come you never see any gorillas who are hung like a horse below the belt? - Quora