Penile sheath

Almost all mammal penises have foreskins, although in non-human cases the foreskin is usually a sheath (sometimes called the preputial sheath or penile sheath) into which the whole penis is retracted. In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. Only monotremes (the platypus and the echidna) lack foreskins.

单词	Penal sheath
释义	Penal sheath 英语百科 Penile sheath Almost all mammal penises have foreskins, although in non-human cases the foreskin is usually a sheath (sometimes called the preputial sheath or penile sheath) into which the whole penis is retracted. In koalas, the foreskin contains naturally occurring bacteria that play an important role in fertilization. Only monotremes (the platypus and the echidna) lack foreskins.
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Penal sheath

Penile sheath