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Sexual reproduction has been on Earth for 1.5 billion years. It is one of our most instinctual behaviors. Even sheep know how to reproduce and few can argue they are not the most intelligent of animals.

Just a sub point. It is generally assumed that "cavemen" were slow witted and stupid. There is growing evidence that neanderthal (most peoples image of cavemen) were in fact almost as intelligent as homo sapien. They made stone tools and appreciated art in a way we used to assume was purely a modern human trait.

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15y ago

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