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Why do men retain nipples? Is it because genes took the easy way out instead of building a separate system, while leaving a possible fallback?

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为什么男性会保留乳头？是不是基因偷懒不想另起炉灶和留条可能性后路？

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Ranking history & source details

First recorded Oct 29, 2026, 1:52 PM CST · latest Oct 29, 2026, 1:52 PM CST. Ranks reflect attention on each platform.

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DayPlatformBest rankLast rank
2026-10-29Zhihu Hot List#11#11
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