Sexual Penis

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Sexual anatomy that’s typically called male includes your penis and scrotum (external male genitalia) and internal reproductive organs like the testicles.
Your penis and scrotum are the two parts of the male (or what’s typically called male) external sex anatomy (outside your body).
Your penis is made of 3 layers of spongy tissue. When you get turned on, blood fills these tissues. This makes your penis get harder and stand up, which is also called getting an erection or hard-on.
The average size of an adult erect (hard) penis is 5 to 7 inches long. The size of your penis when it’s flaccid (soft) doesn’t have much to do with its size when it’s hard. Some penises get much bigger when they get hard. Others stay pretty much the same size.
About half of all penises in the US are circumcised, and half are uncircumcised (still have foreskin) — so both types are common. Some people call circumcised penises “cut,” and uncircumcised penises “uncut.”
Every penis looks a little different. For example, some curve like a banana when they’re hard. Others are straighter. All penises have the same parts though:
Glans
Your glans is also called the head or tip of your penis. The opening of your urethra is here. This is where pre-ejaculate (precum) and semen (cum) come out of, and it’s where you pee out of. For many people, it’s the most sensitive part of the penis.
Shaft
The shaft of your penis extends from the tip to where it connects to your lower belly. It looks like a tube. Your urethra is inside the shaft.
Foreskin
The foreskin is a patch of skin that covers and protects the head (AKA glans). When your penis gets hard, the foreskin pulls back and the tip is exposed. Sometimes foreskin is circumcised (when a doctor surgically removes your foreskin) soon after birth, so not everyone has it.
Frenulum
The frenulum is where your foreskin meets the underside of your penis. It looks like a small V just below the head. Usually part of it remains after circumcision. And for many people, it’s very sensitive.
Scrotum
The scrotum (AKA ballsack) is the sac of skin that hangs below your penis. Your scrotum holds your testicles and keeps them at the right temperature. If it’s too cold, your scrotum pulls your testicles closer to your body. If it's too warm, your testicles hang away from your body.

Your scrotum is covered with wrinkly skin and hair. Your scrotum can be big or small, have a little or a lot of hair, and vary in color. Some people’s scrotum is larger on one side than the other.

The scrotum is super sensitive, so any hitting or twisting is extremely painful. But many people like having their scrotum gently touched during sex.
Anus
The anus (AKA butthole) is the opening to your rectum. The anus has lots of sensitive nerve endings, so some people experience sexual pleasure from anal stimulation.
 
The internal parts of male sex anatomy are made up of:
Testicles 
The testicles (AKA balls) are 2 ball-like glands inside your scrotum. They make sperm and hormones like testosterone.
Epididymis
The epididymis is a tube where your sperm matures. It connects each testicle to each vas deferens. And it holds your sperm before you ejaculate (come).
Vas Deferens
A vas deferens is a long, narrow tube that carries sperm from the epididymis to the seminal vesicles when you ejaculate (come). There are 2 of them — one connected to each epididymis.
Seminal Vesicles
Seminal vesicles are 2 small organs that produce semen, the fluid that sperm moves around in. They’re located below your bladder.
Prostate Gland
The prostate gland makes a fluid that helps your sperm move. It’s about the size of a walnut or golf ball. The prostate gland is sensitive to pressure or touch in a way that many people find pleasurable.
Cowper’s glands
The Cowper’s glands produce a fluid called pre-ejaculate or precum. This fluid prepares your urethra for ejaculation (coming). It reduces friction so your semen can move more easily. The Cowper’s glands are under the prostate and attach to your urethra. They’re also called bulbourethral glands.
Urethra
The urethra is the tube that carries urine (pee), pre-ejaculate, and semen to your urethral opening and out of your body.
Cremaster
The cremaster is a muscle that moves your scrotum and testicles closer to your body. This happens when you’re cold, you’re aroused, or when someone touches your inner thigh.
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This article is about penises of animals in general. For the human organ, see human penis.
A penis (plural penises or penes /-niːz/) is the primary sexual organ that male animals use to inseminate females (or hermaphrodites) 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 penises in the various species are not necessarily homologous.
The term penis applies to many intromittent organs, but not to all. As an example, the intromittent organ of most cephalopoda is the hectocotylus, a specialized 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, but in the placental mammals the penis bears the distal part of the urethra, which discharges both urine during urination and semen during copulation.[2]
Most male birds (e.g., roosters and turkeys) have a cloaca (also present on the female), but not a penis. Among bird species with a penis are paleognathes (tinamous and ratites)[3] and Anatidae (ducks, geese and swans).[4] A bird penis is different in structure from mammal penises, being an erectile expansion of the cloacal wall and being erected by lymph, not blood.[5] It is usually partially feathered and in some species features spines and brush-like filaments, and in flaccid state curls up inside the cloaca. 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.
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.[6] The male waterfowl evolution of a phallus to forcefully copulate with females has led to counteradaptations in females in the form of vaginal structures called dead end sacs and clockwise coils. 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.[6]
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.[7][8] 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. The lake duck has a corkscrew shaped penis.[9]
Male and female emus are similar in appearance,[10] although the male's penis can become visible when it defecates.[11]
The male tinamou has a corkscrew shaped penis, similar to those of the ratites and to the hemipenis of some reptiles. Females have a small phallic organ in the cloaca which becomes larger during the breeding season.[12]
Wikimedia Commons has media related to Mammal penis.
As with any other bodily attribute, the length and girth of the penis can be highly variable between mammals of different species.[13][14] In many mammals, the size of a flaccid penis is smaller than its erect size.
A bone called the baculum or os penis is present in most mammals but absent in humans, cattle and horses.
In mammals the penis is divided into three parts:[15]
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). Some mammals have a lot of erectile tissue relative to 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. As a general rule, a mammal's penis is proportional to its body size, but this varies greatly between species – even between closely related ones. For example, an adult gorilla's erect penis is about 4.5 cm (1.8 in) in length; an adult chimpanzee, significantly smaller (in body size) than a gorilla, has a penis size about double that of the gorilla. In comparison, the human penis is larger than that of any other primate, both in proportion to body size and in absolute terms.[16]
The penises of even-toed ungulates are curved in an S-shape when not erect.[17] In bulls, rams and boars, the sigmoid flexure of the penis straightens out during erection.[18]
When mating, the tip of a male pronghorn's penis is often the first part to touch the female pronghorn.[19] The pronghorn's penis is about 13 cm (5 in) long, and is shaped like an ice pick.[20] The front of a pronghorn's glans penis is relatively flat, while the back is relatively thick.[21] The male pronghorn usually ejaculates immediately after intromission.[22][23]
The penis of a dromedary camel is covered by a triangular penile sheath opening backwards,[24] and is about 60 cm (24 in) long.[25][26] 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. Copulation time ranges from 7 to 35 minutes, averaging 11–15 minutes.[27][28]
Wikimedia Commons has media related to Bull penis.
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. Protrusion is not affected much by erection, but more by relaxation of the retractor penis muscle and straightening of the sigmoid flexure.[29][15][30]
The male genitalia of mouse deer are similar to those of pigs.[31] A boar's penis, which rotates rhythmically during copulation,[32] is about 46 cm (18 in) long, and ejaculates about a pint of semen.[33] Wild boars have a roughly egg-sized sack near the opening of the penis, which collects urine and emits a sharp odour. The purpose of this is not fully understood.[34]
A stag's penis forms an S-shaped curve when it is not erect, and is retracted into its sheath by the retractor penis muscle.[35] Some deer species spray urine on their bodies by urinating from an erect penis.[36] One type of scent-marking behavior in elk is known as "thrash-urination,[37][38] which typically involves palpitation of the erect penis.[38][39][40] A male elk's urethra points upward so that urine is sprayed almost at a right angle to the penis.[38] A sambar stag will mark himself by spraying urine directly in the face with a highly mobile penis, which is often erect during its rutting activities.[41] Red deer stags often have erect penises during combat.[42]
Wikimedia Commons has media related to Cetacea penis.
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.[43][44][45][46] Cetaceans have fibroelastic penises, similar to those of Artiodactyla.[47] The tapering tip of the cetacean penis is called the pars intrapraeputialis or terminal cone.[48] The blue whale has the largest penis of any organism on the planet, typically measuring 2.4–3.0 m (8–10 ft).[49] Accurate measurements are difficult to take because its erect length can only be observed during mating,[50] which occurs underwater. The penis on a right whale can be up to 2.7 m (8.9 ft) – the testes, at up to 2 m (6 ft 7 in) in length, 78 cm (2 ft 7 in) in diameter, and weighing up to 238 kg (525 lb), are also by far the largest of any animal on Earth.[51] On at least one occasion, a dolphin towed bathers through the water by hooking his erect penis around them.[52] Between male bottlenose dolphins, homosexual behaviour includes rubbing of genitals against each other, which sometimes leads to the males swimming belly to belly, inserting the penis in the other's genital slit and sometimes anus.[53]
Stallions (male horses) have a vascular penis. 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.[54][55][56][57] The glans of the Malayan tapir resembles a mushroom, and is similar to the glans of the horse.[58] The penis of the Sumatran rhinoceros contains two lateral lobes and a structure called the processus glandis.[59]
All members of Carnivora (except hyenas) have a baculum.[60] Canine penises have a structure at the base called the bulbus glandis.[61][62]
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. Once the female retracts her clitoris, the male enters the female by sliding beneath her, an operation facilitated by the penis's upward angle.[63][64] 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.[65] In male spotted hyenas, as well as females, the base of the glans is covered with penile spines.[66][67][68]
Domestic cats have barbed penises, with about 120–150 one millimeter long backwards-pointing spines.[69] Upon withdrawal of the penis, the spines rake the walls of the female's vagina, which is a trigger for ovulation. Lions also have barbed penises.[70][71] Male felids urinate backwards by curving the tip of the glans penis backward.[62][72] When male cheetahs urine-mark their territories, they stand one meter away from a tree or rock surface with the tail raised, pointing the penis either horizontally backward or 60° upward.[73]
The male fossa has an unusually long penis and baculum (penis bone), reaching to between his front legs when erect[74] with backwards-pointing spines along most of its length.[75] The male fossa has scent glands near the penis, with the penile glands emitting a strong odor.[74]
The beech marten's penis is larger than the pine marten's, with the bacula of young beech martens often outsizing those of old pine martens.[76]
Raccoons have penis bones which bend at a 90 degree angle at the tip.[77] The extrusibility of a raccoon's penis can be used to distinguish mature males from immature males.[78][79]
Male walruses possess the largest penis bones of any land mammal, both in absolute size and relative to body size.[80][81]
The adult male American mink's penis is 5.6 cm (2+1⁄4 in) long, and is covered by a sheath. The baculum is well-developed, being triangular in cross section and curved at the tip.[82]
Males of Racey's pipistrelle bat have a long, straight penis with a notch between the shaft and the narrow, egg-shaped glans penis. Near the top, the penis is haired, but the base is almost naked. In the baculum (penis bone), the shaft is long and narrow and slightly curved.[83] The length of the penis and baculum distinguish P. raceyi from all comparably sized African and Malagasy vespertilionids.[84] In males, penis length is 9.6 to 11.8 mm (3⁄8 to 15⁄32 in) and baculum length is 8.8 to 10.0 mm (11⁄32 to 13⁄32 in).[85]
Copulation by male greater short-nosed fruit bats is dorsoventral and the females lick the shaft or the base of the male's penis, but not the glans which has already penetrated the vagina. 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.[86]
The glans penis of the marsh rice rat is long and robust,[87] averaging 7.3 mm (9⁄32 in) long and 4.6 mm (3⁄16 in) broad, and the baculum (penis bone) is 6.6 mm (1⁄4 in) long.[88] As is characteristic of Sigmodontinae, the marsh rice rat has a complex penis, with the distal (far) end of the baculum ending in three digits.[89] The central digit is notably larger than those at the sides.[87] The outer surface of the penis is mostly covered by small spines, but there is a broad band of nonspinous tissue. 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.[90] On the urethral process, located in the crater at the end of the
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