User:TheHonestScientist/sandbox

There are no penises, I swear. This article is about penises of animals in general. For the human organ, see human penis. "Penile" redirects here. For the community in Kentucky, see Penile, Louisville. "PENIS" redirects here. For the magnetic resonance imaging technique, see Proton-enhanced nuclear induction spectroscopy. Page semi-protected

Penis of an Asian elephant. A penis (plural penises or penes /-niːz/) is the primary sexual organ that male and hermaphrodite animals use to inseminate sexually receptive mates (usually females and hermaphrodites respectively) during copulation.[1] 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 the various species are not necessarily homologous. For example, the penis of a mammal is at most analogous to the penis of a male insect or barnacle.[citation needed]

The term penis applies to many reproductive intromittent organs, but not to all; for example the intromittent organ of most cephalopoda is the hectocotylus, a specialised arm, and male spiders use their pedipalps. Even within the Vertebrata there are morphological variants with specific terminology, such as hemipenes.

In most species of animals in which there is an organ that might reasonably be described as a penis, it has no major function other than intromission, or at least conveying the sperm to the female,[citation needed] but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation as the occasion requires.[2]