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Male secondary sex characteristics

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Secondary sex character

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Secondary sex characteristic - Wikipedia

While primary sex characteristics are those that are present at birth, secondary sex characteristics are those that appear during puberty. These secondary sex characteristics are caused by hormones released at the time of puberty, which usually is around two years earlier in girls than in boys. While both boys and girls grow taller in their teenage years, the male body becomes more muscular, and the shoulders grow broader than the hips, while the female's hips become wider than her shoulders, and breasts develop. Some of the first changes in a boy are the growth of his testicles and growth of pubic hair.
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What are secondary sex characteristics?

The sample included white, African American, and Mexican American boys. All 3 groups were significantly taller and heavier than boys in previous NHANES reports and showed earlier genital maturation and pubic hair growth than previous studies based on Tanner staging. Additional studies are required to further evaluate these findings and to explore the public health implications. In , a study on girls found significant differences in the age of onset of pubertal characteristics by race and also found that the mean age of onset was younger compared with findings from the last 30 to 40 years.
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The adolescent spurt in skeletal and muscular dimensions is closely related to the rapid development of the reproductive system that takes place at this time. There are a few boys, it will be noticed, who do not begin their spurts in height or penis development until the earliest maturers have entirely completed theirs. At ages 13, 14, and 15 there is an enormous variability among any group of boys, who range all the way from practically complete maturity to absolute preadolescence. The same is true of girls aged 11, 12, and
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