When is a man fertile?
|#Sperm production occurs in the testicles. Upon reaching puberty, a man will produce millions of sperm cells every day, each measuring about.||#Testosterone is the hormone that causes boys to develop deeper voices, bigger muscles, and body and facial hair, and it also stimulates the production of sperm .||#The man produces semen for the first time during puberty. In general a boy becomes fertile between the ages of 12 and He can then have children. Even if.||#It is composed of spermatozoa in a semi-viscous fluid. Structures within the male reproductive tract that are involved in the production of semen include.|