Here now are the details about the sex organs of men. These are a remarkable and complicated system of glands, tubes, and containers designed to manufacture the male reproductive cell, called the sperm, to store it, and to deliver it into the woman's body. A man's most obvious sexual organ is penis, which is usually about the length of a finger, although somewhat larger around. It has a small tube which runs from the bladder down through its centre.
One purpose of this tube is to empty urine from the bladder. The other purpose, about which I shall say more later, is a passageway for the sperm. At birth the end of a baby boy's penis is usually covered by a sheath of skin called the foreskin. It is possible to push this skin back, but often it is removed by the doctor just after the baby's birth. This makes it easier to keep the penis clean. Removing the foreskin is called circumcision.
Under the man's penis hangs a sac of loose, crinkly skin called the scrotum, which contains the two testicles or testes. These oval-shaped glands, each about 1 1/2 inches long in a grown man, are where the sperm, the male reproductive cells, are made. In most men, one hangs lower than the other.
Behind and against each testicle is a storage place, the epididymis really a collection of about half a mile of tiny tubes where the millions of sperm cells are matured as they pass through. Each sperm cell is shaped like a tadpole with a long, thin tail and is so small that five hundred of them placed end to end would take up only an inch. Sperm can be seen only through a microscope. From the epididymis teh sperm cells travel through a long flexible tube, the vas deferens or spermatic duct, toward the seminal vesicles, which are two small storage pouches at the back of the prostate gland.
The prostate secretes thick, milky liquid that mixes with the sperm. This mixture is called semen and is stored in the seminal vesicles, the prostrate, and the upper part of the vas deferens, ready to be discharged through the penis and to start the sperm on its way to the egg cell in the female. When a man is sexually stimulated, a remark- able change occurs in his penis. This change is called erection. It is caused by his body quickly sending a supply of blood into the spngy tissues of the usually limp penis.
The penis then grows firm and erect and increases in diameter and in length, becoming commonly from 5 to 8 inches long in a mature man. It stands out from the body at an angle and is then ready for sexual intercourse. The shape and angle of the erect penis differ with different men.