DEVELOPMENT. The first sign of (usually around 9 1/2 to 13 1/2 years old) is an increase in the size of the testicles. Next, pubic hair appears and the penis

An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firmer, engorged and enlarged.

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

An erection (pronounced ee-REK-shən) of a body part such as a man’s penis, a woman’s clitoris or a nipple refers to it becoming larger and harder.

Although the head (or glands) of the penis is very sensitive to touch, touch alone does not bring about an erection. The epicenter responsible for such essential

A penis fracture is a painful injury. Signs might include a cracking sound, immediate loss of the erection, or the development of dark bruising of the penis due to

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WebMD explains the parts of a penis, how you get an erection, and how ejaculation happens.

Photographs of the erect penis showing size, shape and angle of erection

A description of all aspects of male sexuality, including penis size and health, penile anatomy, masculinity and sex.