Generally speaking, the optimal time for couples should be 5 to 15 minutes. Generally speaking, there is no specific time limit for conjugal life, and it needs to be analyzed according to the situation between husband and wife. For example, it is necessary to choose the appropriate time according to the age and physical strength of the husband and wife, and the optimal time should be 5~15 minutes. It is recommended that both husband and wife communicate fully to find a more suitable time for sex, so as to have a more satisfying sexual experience. It is recommended to have intercourse at around 10 p.m., which is the best time for most couples to have intercourse. Couples are advised to carefully clean their sex organs before intercourse and also after intercourse to avoid bacterial infections that can affect genital health.