BETA
腰パンってのは思春期の男子が自分はブリーフ卒業したんだぞっていうのを暗に主張するのから始まったんだって。性教育の研究してる教授が言ってた。だから、それを学生さんに教えたり授業でやるとピタッと腰パンが止まるのだそうだ。
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