Just thought I would throw this out for interesting conversation............
I was discussing this w/ my daughter & it got quite funny.........I suppose body type is crucial in this regard

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The site of briefs on a man w/ a sumo body is never pretty

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or a pair of large boxers on a wiry man
And I don't even want think about a thong on most men......... does any one know of a man that wears those??!!!