I have no idea of the author's gender or age but I am pretty sure they don't need google to know anus don't get wet. I mean.... They most likely have their own? It's not such a wild assumption about the author to figure he must for sure have an asshole?
It’s just a fetish thing. Everyone knows assholes have shit in them and don’t get wet unless you got wet, broken up pieces of diarrhea . These manwhas never show an enema or lube because that isn’t hot!!
Now, I partially agree. Shit is not sexy for most of the public (myself included). But self lubricant asses outside abo stories are... Sort of annoying and hard to see as a fetish. It breaks the "reality" of the story - even in a fantastic setting. Just make them fuck without lube id that's the point, it's about to be painful anyway.
Ain’t no manwha artist or writer seriously thinks men have lubricating asses tho, that’s what I’m saying. It is a fantasy thing as the bottom will be more girly like, meant to be fucked in the ass and the proof is that they’re lubricating. Also, their slick ass hole is beneficial for the top to just slide right in without any prep, since prep isn’t hot (sometimes). Fingering takes a long ass time or so I hear, so authors will short cut it by having the uke prepare themselves before hand or with a vagina asshole bussy. Also, it would hurt for the seme to just force their dick in there too bro, it would snap right off . Do you know how much pressure a sphincter can unleash
Man I wished these artist would do a quick google search what anuses look like and what they can and cant do. Or to just look up "how to properly have gay sex"