It is not allowed to have intercourse before the IUD is placed. If you already have children and do not intend to have more children, you can use the method of contraception by placing an IUD in the uterine cavity of the woman, which is easy to operate, effective in contraception, and has fewer side effects, and is not prone to contraceptive failure due to factors such as forgetfulness. However, before placing the IUD, first of all, women need to go to the gynecology department of the hospital, cooperate with the doctor to do gynecological examinations, and confirm that there is no vaginitis, cervicitis and endometritis before placing the IUD. Generally speaking, if you want to place an IUD, you need to go to the gynecology department of the hospital within 3-7 days after your menstrual period is cleared, and cooperate with the doctor to choose the right type of IUD for you. You should not have coitus before placing the IUD in order to avoid pregnancy before placing the IUD and getting pregnant with the IUD. Moreover, the placement of the IUD is usually easy to damage the lining of the uterine cavity, and if you have intercourse before the placement of the IUD, it is easy to cause infection in the uterine cavity.