A penis ( plural penises or penes / - n iː z / ) is the primary sexual organ that male animals use to inseminate sexually receptive mates ( usually females and hermaphrodites) during copulation. Such organs occur in many animals, both vertebrate and invertebrate, but males do not bear a penis in every animal species, and in those species in which the male does bear a so- called penis, the penes in. Endnotes for The Dark Side of Sleeping Pills.
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