Responses
its squirt!! it basically all started in 2020 when mingwa (creator of bj alex) made her uke squirt when he was extremely aroused and having a good time. since then many authors make their characters squirt when the sex is extremely intense.
youre not wrong though about authors having a piss kink because it does seem like piss will be the new thing in bl.

What I don't get that why so many manhwa BL authors have some kinda pee kink/fetish thing going on? It seems to be so common. Is it actually some kinda common Korean cultural kink? Or is peeing why having sex just overall so common and part of the whole act?
I know this is more like B@to comment section question, and you often got good IRL sex advice in there (many of them hilarious written). So I'm trying my luck if some of them are also here to answer.
Sidenote:
I'm still sad I didn't start collecting all those good and funny anecdotes/advice from there and make picture album out of them. Now all of that is lost.
I had that idea so late, and I was too lazy to go back looking for thousands of chapters and comments under them to find the specific comments again.