Whether the frequency of ejaculation (sex or masturbation) once every two days is normal or not should be judged according to the physical condition of each person, generally based on the principle that it does not affect the next erection and that there is no physical discomfort or fatigue. Theoretically, the frequency of ejaculation is calculated by using the formula of “ten digits of age x 9”, with the ten digits being the period and the single digits being the number of times. For example, for people in their 20s, “2 x 9 = 18”, that is, 8 ejaculations in 10 days or less is normal, and so on. In other words, two days of sex or masturbation for young adults is a normal and reasonable range. However, the conclusion drawn from this formula should be the maximum limit, and should be judged according to the actual physical performance of the individual at the moment. If after sex or masturbation, you feel sore, weak, weak feet, or even weak erection, it means that the number of times is too frequent and you need to extend the interval of sex appropriately.