do bl bottoms not have shit up their ass?

Maybe they clean their ass when take a shower:/

Generally, yaoi manga handle that indirectly by the uke saying "I've already prepared myself" or "I need to take a shower first". I mean, I get it - it's not exactly pleasant, nor does it add to the story for the author to depict the uke cleaning/flushing themselves out before sex. But at the same time, it is SO unrealistic for yaoi ukes to get banged anywhere and anytime, and ESPECIALLY without lube. It....it just doesn't work like that LOL