Theoretically, you can have intercourse after 3 days after the end of your period. Women should never have intercourse during their menstrual period, and it is also better not to have intercourse within 3 days after the end of menstruation. In the first 3 days after the end of menstruation, the trauma of endometrial exfoliation has not yet completely returned to normal, so if you have sex too early, it will cause the tiny trauma to bleed again under the effect of sexual stimulation and prolong the menstrual period. After 3 days, the endometrium is completely repaired and the cervical opening is closed, so there is no possibility of rebleeding or reproductive system infection when sexual intercourse occurs at this time.