Tanner stage I is marked by the absence of pubic hair. Tanner
stage II is characterized by light downy hair along the labia.
In Tanner stage III, pubic hair becomes coarser, darker, and curlier,
extending away from the midline. A triangular adult distribution is present
in Tanner stage IV, and Tanner stage V has a similar distribution with spread
to the medial thighs.
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