たんぶらー by ますみざる
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男性器を女性器に出し入れする際、褪臀筋という普段使わない筋肉を使う。
セックス以外では鍛えようの無い筋肉なので、日常的に行為する人と
全く経験の無い人とでは、腰から臀部にかけてのシルエットに明らかな差が出る。
“
— セックス以外では鍛えようの無い筋肉：ぁゃιぃ(*ﾟーﾟ)NEWS 2nd (via peperon999)
Reblogged 2 years ago from peperon999 (originally from sirchronofrost)
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