Once a male is sexually mature, the testes produce sperm continuously. The testes can produce 70 – 100 million sperm per day. It takes 74 days for the spermatogonia in the testes to develop into fine and about 12 – 25 days for the sperm to mature in the epididymis. Any disease or other factor that interferes with male reproductive function can cause male infertility. Semen examination is the most commonly used and easiest way to determine male fertility, but the test is wilfully affected by many factors, so men should pay attention to the following points when doing semen examination: Avoiding bad moods Emotional fluctuations not only have an effect on the production, maturation and activity of spermatozoa, but also on the secretion of semen, which is extremely unfavorable to the spermatozoa survival, and will greatly reduce the success rate of conception. Serious bad mood may also cause premature ejaculation, impotence, and even non-ejaculation. Avoid high-temperature environment Modern young people like to wear swimming trunk-like underwear, narrow and close to the scrotum. Medical research has proved that tightly fitting underwear will not only make body heat not easy to disseminate, leading to bacterial reproduction, and testicles long-term close to the abdomen and femur will make the temperature rise, affecting the quality of sperm. Therefore, taking sanna baths and soaking in bad water will keep the testicles in a high temperature environment for a long time. Animal experiments have proved that if the temperature in the scrotum rises by 2-4 degrees for more than 24 hours, spermatogenic disorders will occur. If the testicles are exposed to an environment of more than 45 degrees for two hours, spermatogenesis will be impeded. Therefore, you should avoid or try to lock up the time of taking a bath before having a semen test. Avoid a lot of smoking and drinking a lot of smoking will increase the content of thiocyanic acid in the semen, which can inhibit sperm activity, smokers semen can be deformed sperm number is significantly higher than the number of non-smokers. Long-term excessive alcohol consumption can make the body synthesize male hormone three enzyme activity is seriously affected, inhibit the testes can not normally produce male hormone and spermatozoa. In addition, coffee, cola, strong tea and other beverages to spermatogenic cells is also a harmful substance, should be avoided or moderate drinking.