Sexual maturity rating (Tanner stages) of pubic hair and external genitalia development in males

• Stage 1 – Prepubertal, with no pubic hair.
• Stage 2 – Sparse, straight pubic hair along the base of the penis.
• Stage 3 – Hair is darker, coarser, and curlier, extending over the mid-pubis.
• Stage 4 – Hair is adult-like in appearance but does not extend to thighs.
• Stage 5 – Hair is adult in appearance, extending from thigh to thigh.

Stages of external genitalia development in males:

• Stage 1 – Prepubertal.
• Stage 2 – Enlargement of testes and scrotum; scrotal skin reddens and changes in texture.
• Stage 3 – Enlargement of penis (length at first); further growth of testes.
• Stage 4 – Increased size of penis with growth in breadth and development of glans; testes and scrotum larger and scrotal skin darker.
• Stage 5 – Adult genitalia.