Got this off www.womenshealth.gov
Most doctors and the American College of Obstetricians and Gynecologists (ACOG) suggest that women steer clear of douching. All healthy vagina's contain some bacteria and other organisms called the vaginal flora. The normal acidity of the vagina keeps the amount of bacteria down. But douching can change this delicate balance. This may make a woman more prone to vaginal infections. Plus, douching can spread existing vaginal infections up into the uterus, fallopian tubes, and ovaries.
Health problems linked to douching include:
•vaginal infections called bacterial vaginosis or BV,
•sexually transmitted diseases (STDs), and
•pelvic inflammatory disease (PID)
Most doctors say that it is best to let your vagina clean itself. The vagina cleans itself naturally by producing mucous. Women do not need to douche to wash away blood, semen, or vaginal discharge. The vagina gets rid of it alone. Also, it is important to note that even healthy, clean vagina's may have a mild odor.
Regular washing with warm water and mild soap during baths and showers will keep the outside of the vagina clean and healthy. Doctors suggest women avoid scented tampons, pad, powders and sprays. These products may increase a woman's chances of getting vaginal infections.