Éruption vésiculaire sur le scrotum et le pénis.
Mallard pseudo-penis Most male birds e. Among bird species with a penis are paleognathes tinamous and ratites  and Anatidae ducks, geese and swans. While most male birds have no external genitalia, male waterfowl Anatidae have a phallus.
Most birds mate with the males balancing on top of the females and touching cloacas in a "cloacal kiss"; this makes forceful insemination very difficult. The phallus that male waterfowl have evolved everts out of their bodies in a clockwise coil and aids in inseminating females without their cooperation. These structures make it harder for males to achieve intromission.
The clockwise coils are significant because the male phallus everts out of their body in a counter-clockwise spiral; therefore, a clockwise vaginal structure would impede forceful copulation.
Studies have shown that the longer a male's phallus is, the more elaborate the vaginal structures were. This reduced the likelihood of fertilization by unwanted aggressors in favor of fitter mates.
The lake duck is notable for possessing, in relation to body length, the longest penis of agrandissement du pénis pendant lexcitation 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.
The lake duck has a corkscrew shaped penis. Females have a small phallic organ in the cloaca which becomes larger during the breeding season. External male genitalia of a Labrador Retriever As with any other bodily encoches sur le pénis, the length and girth of the penis can be highly variable between mammals privé sa virginité dun petit pénis different species. A bone called the baculum or encoches sur le pénis penis is present in most mammals but absent in humans, cattle and horses.
In mammals the penis is divided into three parts:  Roots crura : these begin at the caudal border of the pelvic ischial arch.
Body : the part of the penis extending from the roots. Glans : the free end of the penis. The internal structures of the penis consist mainly of cavernous, erectile tissuewhich is a collection of blood sinusoids separated by sheets of connective tissue trabeculae.
Some mammals have a lot of erectile tissue relative encoches sur le pénis connective tissue, for example horses. Because of this a horse's penis can enlarge more than a bull's penis. The urethra is on the ventral side of the body of the penis. For example, an adult gorilla 's erect penis is about 4.
In comparison, the human penis is larger than that of any encoches sur le pénis primateboth in proportion to body size and in absolute terms. Copulation time ranges from 7 to 35 minutes, averaging 11—15 minutes. Bulls have a fibro-elastic penis. Given the small amount of erectile tissue, there is little enlargement after erection.
The penis is quite rigid when non-erect, and becomes even more rigid during erection.
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Protrusion is not affected much by erection, encoches sur le pénis more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure. The purpose of this is not fully understood.
Cetaceans' reproductive organs are located inside the body. Male cetaceans whales, dolphins, and porpoises have two slits, the genital groove concealing the penis and one further behind for the anus.
The penis on a right whale can be up to 2.
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When non-erect, it is quite flaccid and contained within the prepuce foreskin, or sheath. Tapirs have exceptionally long penises relative to their body size.
Once the female retracts her clitoris, the male enters the female by sliding beneath her, an operation facilitated by the penis's upward angle. Lions also have barbed penises. The baculum is well-developed, being triangular in cross section and curved at the tip. Near the top, the penis is haired, but the base is almost naked.
In the baculum penis bonethe shaft is long and narrow and slightly curved. While the females do this, the penis is not withdrawn and research has shown a positive relationship between length of the time that the penis is licked and the duration of copulation.
Post copulation genital grooming has also been observed. The papilla nipple-like projection on the dorsal upper side of the penis is covered with small spines, a character the marsh rice rat shares only with Oligoryzomys and Oryzomys couesi among oryzomyines examined.
In Transandinomys talamancae,  a single pair of preputial glands is present at the penis. As is usual for sigmodontines, there are two pairs of ventral prostate glands and a single pair of anterior and dorsal prostate glands. Part of the end of the vesicular gland is irregularly folded, not smooth as in most oryzomyines. In the cartilaginous part of the baculum, the central digit is smaller than those at the sides.
The shape could have favored displacement of seminal fluids implanted within the female reproductive tract by rival males: the thrusting action which occurs during sexual intercourse méthode de traite pénis mechanically remove seminal fluid out of the cervix area from a previous mating. They are less densely packed than in Otolemur crassicaudatus. Penis of a human, with encoches sur le pénis hair removed to show anatomical detail The human penis is an external sex organ of male humans.
It is a reproductiveintromittent organ that additionally serves as the urinal duct. The main parts are the root of the penis radix : It is the attached part, consisting of the bulb of penis in the middle and the crus of penisone on either side of the bulb; the body of the penis corpus ; and the epithelium of the penis consists of the shaft skinthe foreskinand the preputial mucosa on the inside of the foreskin and covering the glans penis.
The human penis is made up of three columns of tissue : two corpora cavernosa lie next to each other on the dorsal side and one corpus spongiosum lies between them on the ventral side.
It is a passage both for urine and for the ejaculation of semen. In males, the expulsion of urine from the body is done through the penis.
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The urethra drains the bladder through the prostate gland where it is joined by the ejaculatory ductand then onward to the penis. An erection is the stiffening and rising of the penis, which occurs during sexual arousalthough it can also happen in non-sexual situations. Ejaculation is the ejecting of semen from the penis and is usually accompanied by orgasm. A series of muscular contractions delivers semen, containing male gametes known as sperm cells or spermatozoafrom the penis.
The most common form of genital alteration is circumcisionthe removal of part or all of the foreskin for various cultural, religious, and more rarely medical reasons.
There is controversy surrounding circumcision. As of [update]a systematic review of 15, men, and the best research to date on the papilles sur le pénis, as the subjects were measured by health professionals, rather than self-measured, has concluded that the average length of an erect human penis is The heads used are swapped each time the mammal copulates.
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Please help by editing the article to make improvements to the overall structure. June Learn how and when to remove this template message The penis of the bush hyrax is complex and distinct from that of the other hyrax genera. Additionally, it has been observed that the bush hyrax also has a greater distance between the anus and preputial opening in comparison to other hyraxes.
An adult elephant has the largest penis of any land animal. During its waking hours, it remains hidden beneath a skin receptacle, until it becomes erect and it projects outside in a rostral direction. Tuataras must use their cloacae for reproduction.
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Invertebrates Arthropods The spine-covered penis of Callosobruchus analis, a bean weevil The record for the largest penis size to body size ratio is held by the barnacle. The barnacle's penis can grow to up to forty times its own body length. This enables them to reach the nearest female for fertilization.
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A number of invertebrate species have independently evolved the mating technique of traumatic insemination where the penis penetrates the female's abdomen, thereby creating a womb into which it deposits sperm.
This has been most fully studied in bed bugs. Some millipedes have penises. In these species, the penis is simply one or two projections on underneath the third body segment that produce a spermatophore or sperm packet. The act of insemination, however, occurs through specialized legs called gonopods which collect the spermatophore and insert it into the female.
The male copulatory organ of various lower invertebrate animals is often called the cirrus.
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Species of this genus have sex-reversed genitalia. Females have penis-like organs called gynosomes that are inserted into vagina-like openings of males during mating. That, in turn, is used to transfer the spermatophores to the female. In species where the hectocotylus is missing, the penis is long and able to extend beyond the mantle cavity and transfers the spermatophores directly to the female.
Deepwater squid have the greatest known penis length relative to body size of encoches sur le pénis mobile animals, second in the entire animal kingdom only to certain sessile barnacles Penis elongation in Onykia ingens may result in a penis that is as long as the mantle, head and arms combined. Prior to the adoption of the Latin word in English the penis was referred to as a "yard". The Oxford English Dictionary cites an example of the word yard used in this sense from and notes that in his Physical Dictionary ofSteven Blankaart defined the word penis as "the Yard, made up of two nervous Bodies, the Channel, Nut, Skin, and Fore-skin, etc.
As with nearly any aspect of the body involved in sexual or excretory functions, the penis is the subject of many slang words and euphemisms for it, a particularly common and enduring one being "cock". See WikiSaurus:penis for a list of alternative words for penis. See also.