The most suitable frequency of physiological demand varies from person to person due to the differences in physical condition, age and hormone secretion level of each woman. The most suitable frequency of physiological needs is not to appear fatigue, does not affect life and work shall prevail. 20-30 years old people, because the physiological needs are in the peak period, it is recommended that about 2-3 times a week; 30-40 years old people not more than 2 times a week; 40-50 years old people 4-5 times a month. The number or frequency can be gradually reduced with age, or be adjusted according to specific circumstances such as gynecological or reproductive diseases after surgery. For women, the appropriate frequency of physiological needs is not more than 3 times a week, because frequent sex can easily lead to gynecological diseases, such as vaginitis, cervicitis, endometritis, etc. In addition, women also need to pay attention to personal cleanliness and hygiene when they have intercourse, before and after both genital organs should be cleaned to avoid infection.