Couple double blessed once into the state of preparation for pregnancy, to pay attention to things to say on three days and three nights can not be said, of course, really want you to listen to three days and three nights, you certainly do not want to, then we will be long-winded and short, listed a few points for your reference. Things to do: 1. Maintain an optimistic mindset. Emotional factors have a significant impact on male sexual functioning, and after intervention with depressed people, it was found that their ability to conceive increased from 29.9% to 45.5%. Therefore, keeping a good mood, establishing an optimistic attitude and abandoning stress can help men enhance their fertility. 2. Keep away from bad living habits and environmental factors. Men should avoid exposure to radiation and substances harmful to the body, such as decoration materials and heavy metals, etc. They should also avoid smoking, drinking and staying up late. 3. Strengthen physical exercise. Strong body is the basis of normal male functions, should be appropriate to adhere to physical exercise, strong body, enhance immunity, relaxation of fatigue and anxiety in the movement. 4. Increase nutrients. Sperm production is closely related to the nutritional level of the diet. Foods that need to be eaten regularly include sea cucumber, sesame seeds, peanut kernels, walnuts and lettuce. What not to do: 1. Drinking alcohol. Sperm density decreases by 56.6% in alcoholics. Heavy drinking can lead to a decrease in testosterone synthesis in men and disorders in sperm production. 2. Smoking. Nicotine, carbon monoxide, cadmium, lead and a lot of other toxic substances in the smoke, easy to damage the spermatogenic cells in the testicles. Research has proved that smoking 20 cigarettes a day, the sperm survival rate is lower than 50%. 3. Long-term sedentary, sitz bath, sauna or wearing tight pants. These behaviors can affect the heat dissipation function and blood circulation of the testicles, so that the local temperature of the testicles increases, hindering spermatogenesis. Soaking in warm water at 43℃-44℃ for 20 minutes for 3 consecutive days, sperm density continues to decline for 3 weeks. 4. Prolonged electromagnetic radiation. Too close to the TV or prolonged exposure to computers, the radiation produced can affect spermatogenesis. 5. Eat celery, soy products and so on. Foreign research has found that after eating a certain amount of celery for many days in a row, the amount of spermatozoa decreased significantly, and it will gradually return to normal only after stopping eating celery for 4 months. In addition, daily consumption of soybean products will make men’s sperm count significantly decreased. 6. Consume cottonseed oil. Serving cottonseed oil can cause cell damage, testicular interstitial fibrosis, blood vessel thickening and the occurrence of testicular autoimmune disease. 7. Excessive cycling or horseback riding. Excessive cycling and horseback riding can subject the prostate and other accessory glands to chronic strain and congestion, affecting their function and aggravating chronic inflammation.