If a woman has not given birth, the vagina is tighter and the male genitalia is larger, which can cause frequent stimulation and painful vulva. The vaginal environment, including the secretions, is a very important factor. The vaginal environment, including secretions, is affected by changes in hormone levels in the body. If estrogen decreases, the vagina may become dry and painful during intercourse. If it is only once in a while, you can wash your vulva with warm water or buy some lotion and take a sitz bath in the basin, as long as it is gynecological cleaning, disinfection and sterilization.