If there is a sex life on the vulva itching, there is no leukorrhea, discharge odor, leukorrhea color yellow and other corresponding symptoms, it is likely to be due to semen allergy to cause itching, you can go to the hospital to do the routine test of leukorrhea, to rule out the possibility of vaginal inflammation. If it is semen allergy, you can use a condom, ejaculate into the condom during sex, to avoid semen and vaginal mucous membrane skin contact and cause allergic phenomenon. In addition, you can also go to the hospital for desensitization treatment, such as glucocorticoids for appropriate treatment, will also improve the coitus caused by allergies caused by vulvar itching, and it is also recommended to use a condom to give contraception during treatment.