Douching consists of washing out the vagina with water or another liquid. Despite popular belief to the contrary, it is not a method of. It is possible that if a thousand women douched after sex and a thousand didn’t, then perhaps not quite so many of the douchers would get pregnant. However, once you have had sex millions of sperm swim immediately into the cervical canal. All the can do is wash out any that are left in the vagina; the others are likely to be heading towards your fallopian tubes with grim determination. By all means douche after sex if you like — this is a common feature of some cultures — but don’t expect it to have any contraceptive effect!