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A douche bag is a piece of equipment for douching. The term "douche bag" is also a popular derogatory term of insult or ridicule (see Writ of Douchebaggery).
It should be noted that douching after sexual intercourse is not effective as a means of contraception. The reason this method (as well as a related method, coitus interruptus or "withdrawal") are usually not very effective is that the male ejaculate typically consists of approximately 5ml (1 teaspoon) of fluid carrying in excess of 500,000,000 sperm, of which only 1 is needed to fertilize the ovum. Thus even a tiny amount of ejaculate can be enough to cause pregnancy.