Like you said guys can't show their dicks so girls can't show their vaginas but men also have balls that aren't allowed to be shown so it only makes sense that boobs would be the collateral ;)
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If you had your balls on your chest then it would be ok.
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Well it's not like I can put a piece of clothing on just my dick and have bare balls. I want to show my balls with pride. Now my penis is a different story but only because nobody wants to see a penis but balls that's a whole different story ;)