A report on Penis

Mallard pseudo-penis
Females have corkscrew vaginas with many blind pockets designed for difficult penetration and to prevent becoming pregnant. This reduced the likelihood of fertilization by unwanted aggressors in favor of fitter mates.
External male genitalia of a Labrador Retriever
Penises of minke whales on display at the Icelandic Phallological Museum
Genitorinary system of a raccoon (Procyon lotor)
Penis of a human, with pubic hair removed to show anatomical detail
The spine-covered penis of Callosobruchus analis, a bean weevil

Primary sexual organ that male animals use to inseminate females (or hermaphrodites) during copulation.

- Penis
Mallard pseudo-penis

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An example of a sōpio (see below), the god Mercury was depicted with an enormous penis on this fresco from Pompeii.

Latin obscenity

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Profane, indecent, or impolite vocabulary of Latin, and its uses.

Profane, indecent, or impolite vocabulary of Latin, and its uses.

An example of a sōpio (see below), the god Mercury was depicted with an enormous penis on this fresco from Pompeii.
Decorative scene in the baths. Some scholars suggest that this is what was meant by a prōtēlum ("team of three").

Mentula is the basic Latin word for penis.

Stained human sperm

Sperm competition

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Competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction.

Competitive process between spermatozoa of two or more different males to fertilize the same egg during sexual reproduction.

Stained human sperm
Human spermatozoa
Neolamprologus pulcher
Indian mealmoth
Drosophila melanogaster
Scanning electron microscopic image of immature parasperm lancet (infertile sperm morph) of Fusitriton oregonensis showing the tail brush still present, which later develops into part of the body of the parasperm. It is produced when sperm competition occurs.
Male dunnocks (Prunella modularis) peck at the female's cloaca, removing sperm of previous mates.

One evolutionary response to sperm competition is the variety in penis morphology of many species.

Cat

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Domestic species of small carnivorous mammal.

Domestic species of small carnivorous mammal.

Skulls of a wildcat (top left), a housecat (top right), and a hybrid between the two. (bottom center)
A cat eating a fish under a chair, a mural in an Egyptian tomb dating to the 15th century BC
Diagram of the general anatomy of a male domestic cat
Cat skull
Shed claw sheaths
Reflection of camera flash from the tapetum lucidum
The whiskers of a cat are highly sensitive to touch
Cat lying on rice straw
Vocalizing domestic cat
The hooked papillae on a cat's tongue act like a hairbrush to help clean and detangle fur
A domestic cat's arched back, raised fur and an open-mouthed hiss are signs of aggression
A domestic cat with its prey, a deermouse
When cats mate, the tomcat (male) bites the scruff of the female's neck as she assumes a position conducive to mating known as lordosis behavior.
Radiography of a pregnant cat. The skeletons of two fetuses are visible on the left and right of the uterus.
A newborn kitten
A tabby cat in snowy weather
Feral farm cat
A cat sleeping on a man's lap
Some cultures are superstitious about black cats, ascribing either good or bad luck to them
A cat with its mouth open exposing its teeth

The female utters a loud yowl as the male pulls out of her because a male cat's penis has a band of about 120–150 backward-pointing penile spines, which are about 1 mm long; upon withdrawal of the penis, the spines may provide the female with increased sexual stimulation, which acts to induce ovulation.

Attic red-figure lid depicting three Vulva and a winged phallus. Origin unknown, c. 460–425 BC. Housed in the National Archaeological Museum in Athens.

Phallus

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Attic red-figure lid depicting three Vulva and a winged phallus. Origin unknown, c. 460–425 BC. Housed in the National Archaeological Museum in Athens.
Tintinnabulum from Pompeii showing a phallus
Egyptian statuette of Osiris with phallus and amulets
Ithyphallic man with a harp, Romano-Egyptian, 3rd–4th century, Brooklyn Museum
Polyphallic wind chime from Pompeii; a bell hung from each phallus
Herm
Ithyphallic Shiva, 3rd century AD
Husavik Phallusmuseum (Icelandic Phallological Museum), Húsavík
Khaled Nabi cemetery in Iran with phallic tombstones. Dating pre-Islamic era.
Phallus representation, Cucuteni Culture, 3000 BC
The bear on the arms of Portein, Switzerland has a clearly visible red phallus, in accordance with the long-held tradition.
Phallic-Head Plate, Gubbio, Italy, 1536
A woman riding a phallic mechanical bull at EXXXOTICA New York 2009
Penis costume at a 2005 parade in San Francisco
Monument to the Carnation Revolution, Lisbon, Portugal

A phallus is a penis (especially when erect), an object that resembles a penis, or a mimetic image of an erect penis.

The constituent cavernous cylinders of the penis. (Bulb labeled at bottom center.)

Bulb of penis

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The constituent cavernous cylinders of the penis. (Bulb labeled at bottom center.)
Male urethra.
Diagram of the arteries of the penis.

Just before each crus of the penis meets its fellow, it presents a slight enlargement, which Georg Ludwig Kobelt named the bulb of the corpus cavernosum penis.

Millipede

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Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature.

Millipedes are a group of arthropods that are characterised by having two pairs of jointed legs on most body segments; they are known scientifically as the class Diplopoda, the name derived from this feature.

Approximate relative diversity of extant millipede orders, ranging from ca. 3,500 species of Polydesmida to 2 species of Siphoniulida
Octoglena sierra (Colobognatha, Polyzoniida)
Anadenobolus monilicornis (Juliformia, Spirobolida)
Harpaphe haydeniana (Polydesmida)
Pauropods are thought to be the closest relative of millipedes.
A representative millipede and centipede (not necessarily to scale)
Representative body types of the Penicillata (top), Pentazonia (middle), and Helminthomorpha (bottom)
Anterior anatomy of a generalized helminthomorph millipede
Paranota of polydesmidan (left) and platydesmidan millipedes
A female Illacme plenipes with 618 legs (309 pairs)
Epibolus pulchripes mating; the male is on the right
Growth stages of Nemasoma (Nemasomatidae), which reaches reproductive maturity in stage V
A Sceliages beetle transporting a millipede carcass
Ammodesmus nimba from Guinea, West Africa, curled in a defensive coil
Psammodesmus bryophorus camouflaged with symbiotic mosses
Giant fire millipede (Aphistogoniulus corallipes), Madagascar
Spotted snake millipedes can be agricultural pests.
Flat millipede found in the Mount Cameroon Forest

The genital openings (gonopores) of both sexes are located on the underside of the third body segment (near the second pair of legs) and may be accompanied in the male by one or two penes which deposit the sperm packets onto the gonopods.

Sexual coercion among animals

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Use of violence, threats, harassment, and other tactics to help them forcefully copulate.

Use of violence, threats, harassment, and other tactics to help them forcefully copulate.

Waterfowl males of the family Aves: Anatidae have evolved a phallus to aid in coercion.

Elephant

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Elephants are the largest existing land animals.

Elephants are the largest existing land animals.

African bush elephant skeleton
African bush elephant with ears spread in a threat or attentive position; note the visible blood vessels
An African forest elephant covering its skin with mud
An Asian elephant walking
African elephant heart in a jar
Forest elephant in habitat. It is considered to be an important seed disperser.
A family of African bush elephants
Lone bull: Adult male elephants spend much of their time alone or in single-sex groups
Bull in musth
Bull mating with a member of a female group
An African forest elephant mother bathing with her calf
A family of African forest elephants in the Dzanga-Sangha Special Reserve wetlands, This species is considered to be critically endangered.
Men with elephant tusks at Dar es Salaam, Tanzania, c. 1900
Working elephant as transport
Battle of Zama by Henri-Paul Motte, 1890
Circus poster, c. 1900
Parable of the elephant and the blind monks; illustrated by Hanabusa Itchō. (Ukiyo-e woodcut, 1888)
Woodcut illustration for "The Elephant's Child" by Rudyard Kipling

The elephant's penis can reach a length of 100 cm and a diameter of 16 cm at the base.

Aedeagus of Pentodon idiota

Aedeagus

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Reproductive organ of male arthropods through which they secrete sperm from the testes during copulation with a female.

Reproductive organ of male arthropods through which they secrete sperm from the testes during copulation with a female.

Aedeagus of Pentodon idiota
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It can be thought of as the insect equivalent of a mammal's penis, though the comparison is fairly loose given the greater complexity of insect reproduction.

1. Human urinary system: 2. Kidney, 3. Renal pelvis, 4. Ureter, 5. Urinary bladder, 6. Urethra. (Left side with frontal section) 7. Adrenal gland Vessels: 8. Renal artery and vein, 9. Inferior vena cava, 10. Abdominal aorta, 11. Common iliac artery and vein Transparent: 12. Liver, 13. Large intestine, 14. Pelvis

Urinary system

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The urinary system, also known as the urinary tract or renal system, consists of the kidneys, ureters, bladder, and the urethra.

The urinary system, also known as the urinary tract or renal system, consists of the kidneys, ureters, bladder, and the urethra.

1. Human urinary system: 2. Kidney, 3. Renal pelvis, 4. Ureter, 5. Urinary bladder, 6. Urethra. (Left side with frontal section) 7. Adrenal gland Vessels: 8. Renal artery and vein, 9. Inferior vena cava, 10. Abdominal aorta, 11. Common iliac artery and vein Transparent: 12. Liver, 13. Large intestine, 14. Pelvis

In placental mammals the male ejects urine through the penis, and the female through the vulva.