If vulvovaginal itching occurs every time you have intercourse, most of the time it is due to an allergic reaction of the vaginal mucosa to sperm, which is the clinical symptom. If you go to the hospital after intercourse, you may find that the vulvar mucosa or vaginal mucosa is red and swollen and other allergic reactions. In this case, it is clinically recommended to use a condom every time you have intercourse, preferably during the whole process of sexual intercourse, so as to avoid contact between sperm and vaginal mucosa and to avoid allergic reactions. In addition, medication should be given clinically, such as oral dexamethasone for 10 days to half a month, mainly as an anti-allergic treatment to avoid itching during intercourse in the future.