A man can be sterile if he has a congenital defect that causes sterility or if he chooses to become sterile through surgery including a vasectomy. He might also be sterile if he has suffered trauma or disease that destroys the testicles.
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It is not advised for a guy to attempt to sterilize himself. There are numerous things like wearing tight clothing which can lower sperm count but sterilization should be done by a doctor.
Depending on your age, a man can get a vasectomy and a woman could get her tubes tied.