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Table 19-1

Stages of Secondary Characteristics: Male Genital Development
DevelopmentCharacteristic
A. Hair growth
  1. None
  2. Scant fine hair at the base of the penis
  3. Darker and curlier hair
  4. Adult type but less hair
  5. Adult
B. Genital development
  1. No change
  2. Larger scrotum and testes, skin redder
  3. Enlargement of penis
  4. Further enlargement of penis, scrotal skin thickening
  5. Adult

Source:Data from Tanner, JM: Foetus into Man: Physical Growth From Conception to Maturity. Harvard University Press, Cambridge, Mass., 1990.