The vagina is a unique female reproductive organ that connects the uterus to the external genitalia and is the organ of sexual intercourse for women, as well as the channel for menstrual flow and delivery of the fetus. During sexual intercourse, stimulation by penile thrusting can make a woman reach orgasm. Sperm is ejaculated into the vagina and enters the uterine cavity through the cervix and travels upward into the fallopian tube to unite with the egg to form a fertilized egg and become pregnant. The fetus will be delivered from the vagina after maturity. Since the vagina is an organ of sexual intercourse that is directly connected to the vulva, it is especially susceptible to inflammatory infections and damage. It is important to wash and change underwear regularly to keep the vagina clean and hygienic, to have a moderate sex life, to be hygienic, and to clean moderately, not excessively, so as not to disturb the balance of the vaginal flora.