Penis

thumb|right|287px|spermatozoon|Spermatozoa, in this case human, are a primary component of normal semen, and the agents of fertilization of female ova.

Ejaculation is the discharge of semen (the ejaculate; normally containing sperm) from the penis through the urethra. It is the final stage and natural objective of male sexual stimulation, and an essential component of natural conception. After forming an erection, many men emit pre-ejaculatory fluid during stimulation prior to ejaculating. Ejaculation involves involuntary contractions of the pelvic floor and is normally linked with orgasm. It is a normal part of male human sexual development.

An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal, sexual attraction or libido, although erections can also be spontaneous. The shape, angle, and direction of an erection vary considerably between humans.

In human anatomy, the penis is an external sex organ through which males ejaculate and urinate. Together with the testes and surrounding structures, the penis functions as part of the male reproductive system.

thumb|A clear thermoplastic elastomer ("jelly") dildo A dildo is a sex toy, often explicitly phallic in appearance, intended for sexual penetration or other sexual activity during masturbation or with sex partners. Dildos are made from a number of solid materials. The shape and size are typically that of a human penis, but there is a wide variation to accommodate the needs of different users. ==Etymology== The etymology of the word dildo was long considered unclear, but the third edition of the Oxford English Dictionary concluded in 2018 that the word originates in nonsense syllables common in

In male human anatomy, the foreskin, also known as the prepuce (), is the double-layered fold of skin, mucosal and muscular tissue at the distal end of the human penis that covers the glans and the urinary meatus. The foreskin is attached to the glans by an elastic band of tissue, known as the frenulum. The outer skin of the foreskin meets with the inner preputial mucosa at the area of the mucocutaneous junction. The foreskin is mobile, fairly stretchable and sustains the glans in a moist environment. Except for humans, a similar structure known as a penile sheath appears in the male sexual or

museum in Reykjavík, Iceland

thumb|320px|Baculum of a dog's penis; the arrow shows the urethral sulcus, which is the groove in which the urethra lies. thumb|Fossil baculum of a Indarctos|bear (Indarctos) from the [[Miocene]]

thumb Hypospadias is a common malformation in fetal development of the penis in which the urethra does not open from its usual location on the head of the penis. It is the second-most common birth defect of the male reproductive system, affecting about one of every 250 males at birth, although when including milder cases, is found in up to 4% of newborn males. Roughly 90% of cases are the less serious distal hypospadias, in which the urethral opening (the meatus) is on or near the head of the penis (glans). The remainder have proximal hypospadias, in which the meatus is all the way back on the

Form of sexual play

annual festival in Kawasaki, Japan

Diphallia, penile duplication (PD), diphallic terata, or diphallasparatus is an extremely rare developmental abnormality in which a male is born with two penises. The first reported case was by Johannes Jacob Wecker in 1609. Its occurrence is 1 in 5.5 million newborn.

priapism observed in the corpses of men who have been executed, particularly by hanging

distal opening of the urethra from which urine leaves the body

thumb|Hōnensai

attempts to restore a foreskin-like function and appearance to a previously circumcised penis

thumb|A painting of Cronus emasculating Uranus, |320x320px Emasculation is the removal of the external male sex organs, which includes both the penis and the scrotum, the latter of which contains the testicles. It is distinct from castration, where only the testicles are removed. Although the terms are sometimes used interchangeably, the potential medical consequences of emasculation are more extensive due to the complications arising from the removal of the penis. There are a range of religious, cultural, punitive, and personal reasons why someone may choose to emasculate himself or another p

picture of man genitalia, usually sent by message service

mating ritual in hermaphroditic flatworms

Tucking is a technique whereby an individual hides the crotch bulge of their penis and scrotum so that they are not conspicuous through clothing.

A pseudo-penis is any structure found on an animal that, while superficially appearing to be a penis, is derived from a different developmental path.

Slang term

pointed structures on the penile glans and/or shaft

park in Samcheok, South Korea

Surgical procedure