Evidence is not clear, but it is possible that rectal douching before
anal sex can increase the risk of transferring
HIV and other diseases. There is evidence that douching sometimes can disrupt the
epithelium, or tissue in the rectum, and if this tissue is damaged, then diseases can spread more easily. There are reports that activities which can have the side effect of causing unintentional forcing of water into the rectum, such as
waterskiing, may cause discomfort but can potentially bring other harms. ==Technique==