You should not have intercourse before wearing the IUD. First of all, there is a time requirement of 3 days after the menstrual period and no intercourse, vaginal medication, or vaginal scrubbing. The reason why intercourse is not allowed is that some people may have a slow and confusing ovulation period. If intercourse is conceived, even if the IUD is performed, it may cause an ectopic pregnancy, or an intrauterine pregnancy, and if the uterus is operated, the child cannot be wanted, so intercourse is prohibited. Because the leucorrhoea needs to be tested before the IUI, if the vagina is medicated and scrubbed, it will affect the laboratory test of the leucorrhoea. In case of mycosis vaginalis, trichomoniasis or bacterial vaginitis, IUI should not be performed and should be performed only after a period of treatment, so that vaginal medication and scrubbing will not affect the results and cause errors in the results, resulting in the occurrence of upstream infection.