Does masturbation makes man sterile?
No, when a man masturbates to the point of ejaculation or has sex with another person, the sperm count temporarily drops, but then grows quickly again. Once they start to produce sperm as pre-teens or teens, men produce a huge amount of sperm cells and are quite capable of producing countless millions throughout life. This ability only slows down to any great extent as a guy moves into later adulthood.
No. Masturbation cannot make a man sterile. Males, unlike females, produce gametes (sperm for males, ova for females) for the remainder of their lives. However, frequent masturbation can lower your sperm count, and thereby lowering your probability of having children. This is due to the frequent masturbations removing sperm at a rate higher than the rate that the body produces sperm, therby decreasing the sperm count. This effect however is not permanent, and the sperm count should recover after a few days without ejaculation.