Penis

The penis is the organ located above the scrotum that is used for urination and sexual intercourse. It is made of three layers of spongy tissue and blood vessels. When aroused blood fills this tissue and the penis becomes erect. The shaft of the penis surrounds the urethra. The head of the penis is covered in foreskin. The foreskin can be circumcised at childbirth or later on in life if desired. Around half of all penises in the United States are circumcised.

Following puberty, the penis lengthens and has the ability to ejaculate begins. Ejaculation is the release of fluids containing sperm during orgasm.

The average size of an adult penis is five to seven inches. The size of a soft penis does not correlate with its size when erect. Penises can in many shapes and sizes. If there are concerns about the shape and size, consult your urologist.

Anatomy

• Glans — head or tip of the penis
• Shaft — a tube-like structure that extends from the tip to the lower belly. It contains the urethra.
• Foreskin — skin that covers and protects the head or glans of the penis. It can be removed through circumcision.
• Frenulum — where the foreskin meets the underside of the penis