Anal sex preperation?

Ok just have to ask this as its something i have no knowledge of but after talking to some people and them admiring that part of me would like to try haha

I wash and shower most days so i'm a clean person but I've heard alot of people saying that before anal sex you have to have an enema to make sure everything is clean inside? It sounds quite umm whats the word 'invasive' and i'm guessing it would be a bit smelly, which might lead to the guy changing his mind about doing it?

i suppose what i'm asking is that alot of these sexual desires are spontanious, so to have to go through this beforehand seems a bit much? i'm guessing its because the guy might come out afterwards messy or smelly? or is it cos it feels nicer for the woman/man?

Sorry if i sound naive, I've experimented on my own (only with finger nothing scary big haha) and know it can feel a bit uncomfortable when something is inside and i don't know if this is normal but i feel the need to go/p*o if something is in there. Would an enema let you relax more knowing you wouldn't have an accident?

DJ x