If vulvar itching occurs after coitus, consider the following possibilities: First, vaginitis, such as mycotic vaginitis, trichomonas vaginitis, bacterial vaginitis, can lead to vulvar itching. During sex due to sexual stimulation will lead to further aggravation of the infection, resulting in vulvar itching. Secondly, it is considered that the male genitals have diseases, such as phimosis and foreskin scale, which can easily bring bacteria into the vagina to cause female infection, leading to discomfort after intercourse. Thirdly, it is considered to be allergic to condoms, which are made of rubber, and some women who are allergic to them can also cause vaginal itching.