[洽特] 陰O上演化螺旋狀的條紋並可以旋轉
前面有人討論人類龜頭上面的傘狀尖端
有演化上的意義
除了把前一個男性的精液掏出來外
也讓女人更容易興奮而受精
突然想到
如果男方在插入女方的時候具有鑽穴這個技能
同時演化出螺旋狀的紋路在OO上
在二次元的世界裡和三次元的世界裡是不是同樣實用呢?
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