After the end of menstruation, it takes about three days or more before you can have intercourse. Theoretically speaking, three days after the end of menstruation, the residual blood in the vagina can be cleared, at this time it is possible to have intercourse, and it will not have too great an impact on the body. However, there are some women who may have incomplete menstrual flow and may experience vaginal bleeding again at any time after the menstrual period has ended, and they should actively cooperate with their doctors for treatment at this time. Women should not have sex when their menstrual period has just ended, because the wound of endometrial stripping has not fully recovered, if they have sex too early, it may cause the tiny wound of endometrium to bleed again under the effect of sexual stimulation, resulting in prolongation of the menstrual period, and it is very easy for pathogenic microorganisms to be brought into the vaginal and uterine cavities, which will lead to the development of infectious diseases in women. Therefore, most women can have intercourse three days after the end of menstruation. Women are advised to pay more attention to the perineal area and change their underwear regularly.