My normal routine to prepare for anal sex is to have two enema's. The first is in the morning, to clean myself from the day before. Combining this. There isn't much research on regular anal douching before sex but we do You can get this stuff in a saline Fleet enema or you can also make. -How much time in advance should you douche before you anticipate sex? .. three Fleet enemas before anal intercourse as having to do solely with anal sex.