Under normal circumstances, women can have intercourse 3 days after menstruation, but they can also choose to have intercourse during the safe period or during ovulation, depending on whether they have the desire to get pregnant or not. If you want to get pregnant, it is better to have intercourse in the middle of the menstrual cycle, because there is ovulation during this period, and the chance of pregnancy is higher, and the egg and sperm will develop into a fertilized egg after sex. Pregnancy is less likely to occur after sex because there are no viable eggs. However, this method is not completely reliable, and good contraception is needed. In addition, women should pay attention to keep their vulva clean and hygienic before and after sex to avoid local infection, and the number and frequency of sex should be moderate to avoid affecting their health.