How often coitus a few times is considered to be overindulgence, this need to analyze the specific problem, which is related to the individual age status and physical condition, etc., the state of each person’s body and each stage of the relationship are different, so the frequency of conjugal life is also different. American scholars according to the age law, summarized a formula: Frequency = age of the ten digits × 9, resulting in a value of the digits on behalf of the frequency, the ten digits on behalf of the cycle, such as: 30 years old, 3 × 9 = 27, that is, 20 days 7 times, about every 3 days; Age 40, 4 x 9 = 36, which is 6 times in 30 days, about once every 5 days; At age 50, 5 x 9 = 45, which is 5 times in 40 days, about every 8 days; However, this is only a reference value and varies from person to person. Also, the frequency is affected by many aspects such as relationship, work, physical health and emotions. Generally speaking, as long as both parties feel satisfied and comfortable during sex, and the next day there is no obvious fatigue such as backache, dizziness and fatigue, then it is moderate. Moderate married life is conducive to physical and mental health, family harmony, but excessive sexual desire is detrimental to health.