If the patient does not have vaginal itching before intercourse and has vaginal itching after each intercourse, there are two main possibilities to consider and deal with the cause: First, if the patient has intercourse with condoms every time, consider that the patient may be allergic to condoms. Therefore, in this case, it is necessary to change another brand of condom, or use intrauterine device, or take compound short-acting contraceptive pills to prevent pregnancy. Secondly, the itching is caused by pathogenic bacteria in the male penis, which is transmitted to women after intercourse and causes vaginal inflammatory disease in women. Patients need to have a gynecological internal examination and a white belt test to determine the type of inflammation and then systematically treat it. While the woman is being treated, the man should also be treated actively and should not have intercourse during the treatment period.