There's a perception of the ass as a malfunctioning chocolate soft-serve ice cream machine, explosively scattering creamy poo everywhere.
Ah, a fellow Savage Lovecast fan, I see... Good response, as well.
OP:
Do you? And if you don’t, why?
I myself have this set-up:
It's sorta permanently attached to the showerhead via a deflector valve. Anytime I need to do a clean-out, I simply adjust the water temp to lukewarm, switch the water flow to the hose, adjusting so the flow is about 5 to 6" high and pop that baby in my hole for about 8 seconds. I "flush out" the resulting water into a small pail I keep nearby and dump it into the toilet next to the bath. Repeat three or four times and I'm usually good to go. Unless I'm expecting to do deep ass play, I don't overfill so it only takes a few minutes. If I do more than 8 seconds of filling, I risk starting to get water up in the sigmoid colon, then you're into long clean-outs, like BBB2.5 mentions above.
For most purposes, you only need to clear out the blue area.
If you watch what you eat, even that is possibly not something you need to do often.
And no, not all bottoms do enemas. Some that don't should, while some that do might not need to. It's all a bit of a crap shoot, so to speak. And if you're fucking someone in the ass (or get fucked), you just need to be aware and accept that sometimes shit happens. It's usually very minor when it does. Wipe up and carry on.