genital development in males

Last reviewed 04/2023

Development is as follows:

  • stage 1: prepubertal
  • stage 2: scrotal enlargement and reddening, testicular enlargement
  • stage 3:
    • penile lengthening, thinning of the scrotal skin, testicular enlargement
    • begins between 10.5 and 14.5 years
  • stage 4: glans enlargement, penile broadening, testicular enlargement, scrotal increase in size and deepening of pigmentation
  • stage 5: adult

Spermatogenesis is active from the time of penile growth; an ejaculate can be produced from 1 year after its onset.