Penis

peniledickcockmammalian peniscat's penisintromittent organmale genitaliamammal penisphalluselephant's penis
A penis (plural penises or penes ) is the primary sexual organ that male animals use to inseminate sexually receptive mates (usually females and hermaphrodites) during copulation.wikipedia
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Sexual intercourse

sexcopulationintercourse
A penis (plural penises or penes ) is the primary sexual organ that male animals use to inseminate sexually receptive mates (usually females and hermaphrodites) during copulation.

Sex organ

genitaliagenitalsgenital
A penis (plural penises or penes ) is the primary sexual organ that male animals use to inseminate sexually receptive mates (usually females and hermaphrodites) during copulation.
The Latin term genitalia, sometimes anglicized as genitals, is used to describe the externally visible sex organs: in male mammals, the penis and scrotum; and in female mammals, the vulva and its organs.

Erection

erectpenile erectionerect penis
In many mammals, the size of a flaccid penis is smaller than its erect size.
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged.

Baculum

baculapenis boneos penis
A bone called the baculum or os penis is present in most mammals but absent in humans, cattle and horses.
The baculum (also penis bone, penile bone, or os penis, or os priapi ) is a bone found in the penis of many placental mammals.

Anatidae

wildfowlwater fowlwaterfowl
Among bird species with a penis are paleognathes (tinamous and ratites) and Anatidae (ducks, geese and swans).
Anatidae is a large proportion of the 3% of bird species to possess a penis, though they vary significantly in size, shape, and surface elaboration.

Human penis

penispenisesdick
In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms.
The body of the penis is made up of three columns of tissue: two corpora cavernosa on the dorsal side and corpus spongiosum between them on the ventral side.

Glans penis

glanscoronal sulcusglans of the penis
Male felids urinate backwards by curving the tip of the glans penis backward.
The glans penis, more commonly referred to as the glans, is a structure at the distal end of the penis in male mammals.

Retractor muscle of the penis

retractor penis musclepenis retractor muscleretractor muscle
Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure.
In some animals the male penis possesses a muscle enabling retraction into the prepuce.

Penile spines

covered by small spinesspiny penisesbears spines or hooks
It is theorized that the remarkable size of their spiny penises with bristled tips may have evolved in response to competitive pressure in these highly promiscuous birds, removing sperm from previous matings in the manner of a bottle brush.
Upon withdrawal of a cat's penis, the spines rake the walls of the female's vagina, which may serve as a trigger for ovulation.

Vulva

pudendal cleftexternal female genitaliacunnus
The camelmen often aid the male to enter his penis into the female's vulva, though the male is considered able to do it on his own.
The clitoris is the homologue of the penis, and the clitoral hood is the female equivalent of the male foreskin, and may be partially or completely hidden within the pudendal cleft.

Lake duck

Oxyura vittataArgentine ruddy ducka duck
The lake duck (also called Argentine blue-bill) has the largest penis in relation to body size of all vertebrates; while usually about half the body size (20 cm), a specimen with a penis 42.5 cm long is documented. The lake duck is notable for possessing, in relation to body length, the longest penis of all vertebrates; the penis, which is typically coiled up in flaccid state, can reach about the same length as the animal himself when fully erect, but is more commonly about half the bird's length.
It also has the longest penis of any vertebrate in relation to body length.

Clitoris

clitoralclitoral glansglans clitoridis
During copulation, the spotted hyena inserts his penis through the female's pseudo-penis instead of directly through the vagina, which is blocked by the false scrotum and testes.
Unlike the penis, the male homologue (equivalent) to the clitoris, it usually does not contain the distal portion (or opening) of the urethra and is therefore not used for urination.

Hemipenis

hemipenessnake penishemipenal
Even within the Vertebrata there are morphological variants with specific terminology, such as hemipenes.
Squamate hemipenes also develop from a different cell origin, originating from the same embryonic cells that produce the limbs, whereas mammalian penises arise from the embryonic cells that develop the tail.

Largest body part

largestlongestLargest body parts
The lake duck is notable for possessing, in relation to body length, the longest penis of all vertebrates; the penis, which is typically coiled up in flaccid state, can reach about the same length as the animal himself when fully erect, but is more commonly about half the bird's length.

Vagina

birth canalvaginalvaginal opening
During copulation, the spotted hyena inserts his penis through the female's pseudo-penis instead of directly through the vagina, which is blocked by the false scrotum and testes.
The texture of the vaginal walls creates friction for the penis during sexual intercourse and stimulates it toward ejaculation, enabling fertilization.

Cloaca

ventcloacalcloacae
Most male birds (e.g., roosters and turkeys) have a cloaca (also present on the female), but not a penis.
For some birds, such as ostriches, cassowaries, kiwi, geese, and some species of swans and ducks, the males do not use the cloaca for reproduction, but have a phallus.

Intromittent organ

intromissioncopulatory organintromittently
The term penis applies to many 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.
In some turtles, crocodiles, some birds, and in all mammals, males possess a penis centered along the midline of the body.

Erectile tissue

erectileerect
The internal structures of the penis consist mainly of cavernous, erectile tissue, which is a collection of blood sinusoids separated by sheets of connective tissue (trabeculae).
Erectile tissue exists in places such as the corpora cavernosa of the penis, and in the clitoris or in the bulbs of vestibule.

Tinamou

TinamidaeTinamiformestinamous
Among bird species with a penis are paleognathes (tinamous and ratites) and Anatidae (ducks, geese and swans).
The male has a corkscrew shaped penis, similar to those of the ratites and to the hemipenis of some reptiles.

Foreskin

prepuceforeskinspenial sheath
When non-erect, it is quite flaccid and contained within the prepuce (foreskin, or sheath).
The highly innervated mucocutaneous zone of the penis occurs near the tip of the foreskin.

Penile sheath

sheathprepucepenis sheath
The adult male American mink's penis is 5.6 cm long, and is covered by a sheath.
Almost all mammal penises have foreskins or prepuce, although in non-human cases the foreskin is usually a sheath (sometimes called the preputial sheath, praeputium or penile sheath ) into which the whole penis is retracted.

Primate

primatesnon-human primatesnon-human primate
In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms.
Male primates have a pendulous penis and scrotal testes.

Dromedary

Dromedary cameldromedariescamel
The penis of a dromedary camel is covered by a triangular penile sheath opening backwards, and is about 60 cm long.
The penis is covered by a triangular penile sheath that opens backwards; it is about 60 cm long.

Glans

glāns
The pseudo-penis closely resembles the male hyena's penis, but can be distinguished from the male's genitalia by its greater thickness and more rounded glans.
The glans (, plural "glandes" ; from the Latin word for "acorn") is a vascular structure located at the tip of the penis in male mammals or a homologous genital structure of the clitoris in female mammals.

Dolphin

dolphinsgenital slitaquatic mammal
Cetaceans' reproductive organs are located inside the body.
Males have two slits, one concealing the penis and one further behind for the anus.