As the male proceeds through puberty, the semen develops mature characteristics with increasing quantities of normal sperm. Semen produced 12 to 14 months after the first ejaculation liquefies after a short period of time. Within 24 months of the first ejaculation, the semen volume and the quantity and characteristics of the sperm match that of adult male semen.
Reference 1: Average volume (milliliter) and Average sperm concentration (million sperm/milliliter).
Reference 2: 0, 6, 12, 18 and 24.
Source: http://en.wikipedia.org/wiki/Ejaculation
Reference 2: 0, 6, 12, 18 and 24.
Source: http://en.wikipedia.org/wiki/Ejaculation
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