It is generally recommended that women have sex three days after their menstrual period, as this will not easily lead to pelvic infection and pelvic inflammatory disease. Usually when a woman’s period has just cleared, the menstrual blood may still be stagnant in the vagina and not discharged in a timely manner, so it will make the woman think that the menstrual blood has been completely cleared. If you arrange to have intercourse too early at this time, it is easy to cause pathogenic bacteria to go up to the pelvic cavity to get infected. After three days of menstruation, the blood in the vagina has basically been completely discharged, and at the same time the lining of the uterine cavity is also relatively well repaired, so it is not easy to appear infected in the case of normal coitus. It is also recommended that women before and after intercourse need to use warm water, or lotion to wash the vulva, keep the vulva clean and dry, to avoid vaginitis or pelvic inflammatory disease caused by unclean sex.