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.

Why Did Humans Evolve Big Penises But Small Testicles?

TIL that Harmabe's sperm was collected shortly after he died so that his genes could live on. : r/todayilearned

Human evolution – information, recherche et analyse – La Conversation

12 Things You Need To Know About Your Testicles - Men's Journal

Professor Mark Maslin 𝕏 🙄 on X: So why do chimpanzees have relatively small penises but huge testicles while humans have big penises and small testicles? - it's all down to the

Penis – News, Research and Analysis – The Conversation – page 1