1, fear of smoking and alcohol. Smoking and alcohol abuse is the enemy of sperm. The nicotine in cigarettes not only reduces the secretion of sex hormones in men’s bodies but also has a direct killing power on sperm. Long-term heavy drinking, alcohol will make 70% of the sperm stunted or inactive. 2, hungry. Some men are picky eaters and do not like to eat animal food. Long days will make the body zinc content decline, men lack of zinc, will make the libido and sexual function is reduced, the number of sperm decline. 3, heat. The scrotum is the “thermostat” of the testicles, whose temperature is usually 1 to 2 degrees Celsius lower than the body temperature. Only under normal circumstances can the testicles produce normal sperm. If a man has a hobby of taking hot baths, it will reduce sperm production. 4, frequency. Too frequent intercourse will reduce the amount of sperm in each ejaculate, if less than 20 million sperm per milliliter of semen, the chances of pregnancy will be few. 5, worry. Because of family matters husband and wife discord, mutual blame, both parties in depression or worry all day long can directly affect the body’s nervous system and endocrine function, so that testicular sperm function disorders lead to infertility. 6, drugs and X-rays. Some drugs have damaging effects on sperm, such as furans, hormones, etc. can induce sperm growth disorders, sperm chromosome damage or fracture; receiving high doses of radiation can cause sperm chromosome aberrations.