When i started to play with myself many years ago, i think the only thing i did was get a bowel movement, aka just poop at the toilet, before playing with little toys or things that weren't big.
Now i always clean before play. If I'm just going to stretch a little i give my self a balloon clean out after a bowel movement.
If I'm going to play extreme, stretching, colon play, pool balls and bigger, than i clean out with an enema. 4 times 2qt bags until clear. I do the same if I'm going to have a player coming over.
But I know beforehand I'm going to play for hours. Usually between 3 and 4 hours.
But yes I have ran into accidents and I'm not to happy with it, but I'm getting less concerned. If I feel the need to play and don't clean but just with one balloon, i know i might end up with some poop. I know that and accept it, but I do keep an watchful eye.
Now mostly i don't run into poop unless I play with my pool balls and i have to push to get them out, this somehow tickles my sigmoid to open up and let some poop go.
I prefer being totally clean, but if I just want a quicky than i assume the risk.
I haven't inserted anything or licked ass in play partners yet, but I insist they will be clean.
But I'm always ready to go extreme if I'm expecting someone to come over and play.