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The vagina, like many other areas of the body, can cleanse itself. Thus there is very little reason for a normal, healthy woman to use a vaginal douche. Douching can upset the balance of the vaginal flora and change the vaginal pH, thus predisposing the woman to vaginitis. There is no evidence that a postcoital vaginal douche is effective as a contraceptive.
In at least one investigation, vaginal douching has been shown to be a risk factor for pelvic inflammatory disease (PID). The more frequently the subjects douched, the more likely they were to have PID.