THE FIFTH STAGE SEXUAL DEVELOPMENT
Doctors have divided the growth and development of the genital, or sex, organs into the five stages. You may be in one of these stages or you may be between one stage and another. See if you can find the stage you are closest to.
Stage 5
This is the adult or fully grown stage. The testicles are usually about 45 mm (13A in) long, and generally between 16 and 27 ml (3 1/5 – 5 2/5 teaspoons). The scrotal sac is also fully developed by the time a boy reaches this stage. And the skin of the scrotum and penis has become even deeper in colour.
A grown man’s penis is usually 83-108 mm (3 ¼- 4 ¼ in) in length. When a man or boy has an erection, his penis gets temporarily larger. The largest erect penis ever recorded by a doctor was 304 mm (12 in) long. The smallest was 120 mm (4 ¾ in). Ninety out of 100 men will have a penis that is between 127 and 178 mm (5-7 in) in length when it is erect, with the average length being about 160 mm (6 ¼ in). The smaller a penis is when it is soft, the more length it tends to gain when it becomes erect. For example, a man with a penis that measures 75 mm (3 in) when it is soft may add as many as 83 mm (3 ¼ in) when his penis becomes hard. A man with a penis that measures 108 mm (4 ¼ in) when soft might add only 50 mm (2 in) during an erection.
The penis may also get temporarily smaller from time to time. You may have noticed that your penis gets a little smaller if you jump into a cold bath or shower. Cold weather, being really tired or feeling nervous may also make your penis shrivel up a bit. Any of these things may also make your scrotal sac pull up closer to your body and seem smaller temporarily. In old age the penis tends to become a bit smaller in size permanently.
The average age that boys reach Stage 5 is about 16, although, as with Stages 1 to 4, there will be boys who enter Stage 5 when they are younger and some when they are older.
The pubic hair is also fairly well developed by Stage 5, but pubic hair may continue to grow until the boy reaches the age of 20.
Some boys have quite a bit of pubic hair; others have very little. How much you have will probably depend on your family. If the men in your family have lots of hair, you probably will too. If the men in your family are not especially hairy, the chances are that you will not be either. Again, this is not a hard and fast rule, but boys often take after their fathers in this way.
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