It depends on the time of the day for me. I know my body and when things take their course. The only times I douche is in the morning or if I have the time for the big toys in my box. If it is the afternoon/evening I don't really have the need to. I have a towel that only gets used by me and that's all it gets used for, anal play. I have never had poo come out but santorum
does happen, mostly due to the amount of lube I like to use. Nothing an Eden wipe or paper towel will not take care of.
The key here is to know when you body does stuff, the rectum does not store fecal matter. That is the colons job, the rectum makes it ready to dispose of once the colon is full. A couple of hours (or so) after a bowel movement the rectum is pretty clean. A good diet also helps.