Douching after sex?

[waveof-fashion.livejournal.com]

so my friend and I were talking...and she insists that when you have sex without a condom(where the guy cums inside you) *provided that you have some other sort of birth control* that you're supposed to douche it out afterwards..is this true? I've never heard anything like that..I always assumed that it just kind of got rid of itself. So whats the deal? To douche or not to douche?