Can anyone explain big penises?

As a dude, I understand the importance for guys to desire a big one. It's a bizarre power competition that I assumed only guys cared about. But after reading through here a bit, my perceptions have changed. Now I know that, yes, penis size does matter to women. Why? I know this might be like asking why are breast or butts pretty: they just are. But I would love to hear reasons from women themselves, why a big cock?
Can anyone explain big penises?
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