I think you might mean a douche, which is a solution of water and vinegar or water and medication that is sprayed inside the vagina to clean it. (No woman ever needs to use a douche unless it is by a doctor's orders.)
Douche bag or douching is also commonly used as an insult.
I hope that is some help. If that wasn't the word you are looking for I'll feel quite silly, but the next closest is deucing, which is just a tennis term.
EDIT: I suddenly feel the need to clarify.
Douching is NOT a form of birth control. Trying to remove sperm from your body in this way is a bad idea, because although it does remove some sperm it also breaks down your body's natural defenses against sperm, making it easier to conceive.
Douching is NOT a really good idea, ever. The inside of vagina does not need to be cleaned. If you are healthy it keeps itself clean. Douching upsets the balance of bacteria in the vagina and can lead to infections AND women who douche are 70% more likely to develop cancer in their pelvic regions. [ Razhie's advice column | Ask Razhie A Question ]
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