As of 2015, the average erect human penis is 13.12 cm (5.17 in) long and has a circumference of 11.66 cm (4.59 in). An erect penis may be straight or curved and may point at an upward angle, a downward angle, or straight ahead. In its fully erect state, the corpus becomes rigid and the glans becomes engorged but not rigid. In its flaccid state the penis is smaller, gives to pressure, and the glans is covered by the foreskin. Erections can occur in non-sexual situations spontaneous non-sexual erections frequently occur during adolescence and sleep.
An erection is the stiffening expansion and orthogonal reorientation of the penis, which occurs during sexual arousal.
REAL PENIS SHAPES SKIN
The skin around the penis and the urethra share the same embryonic origin as the labia minora in females. Most of the penis develops from the same embryonic tissue as the clitoris in females. It is a passage both for urination and ejaculation of semen ( see male reproductive system). The urethra traverses the corpus spongiosum, and its opening, the meatus ( / m iː ˈ eɪ t ə s/), lies on the tip of the glans penis. The human male urethra passes through the prostate gland, where it is joined by the ejaculatory duct, and then through the penis. 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. The main parts are the root (radix) the body (corpus) and the epithelium of the penis including the shaft skin and the foreskin (prepuce) covering the glans penis.
In human anatomy, the penis ( / ˈ p iː n ɪ s/ PL: penises or penes from the Latin pēnis, initially "tail" ) is an external male intromittent organ that additionally serves as the urinary duct.
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