A member asked:

When a boy first ejaculates, does he already have comparable adult sperm count/motility, or does he gradually get there over time, how long?

A doctor has provided 1 answer

Fertile sperm are present during puberty after the hormonal stimulation triggers their formation. The penis is wired to achieve erection from birth on which can be surprising to some. . When spontaneous "nightfall" or erection/semen expulsion in sleep occurs in the teen years it may contain viable sperm.

Answered 4/3/2021

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