Do people secretely like these kinds of doujins? For as much hate as they get in the comments section I was surprised to see the two most popular ones currently (Obsessed and Scandal) both use cheating/NTR.
People, including me, spit their hatred on it because in addition to often being poorly done / bad-written, it's something almost everyone consciously hates.
However, if they are so popular, it's because lots of people have experienced cheating or NTR, whether it's on the cheater or the cheated on side; and thus they read this kind of stories because it sends them back to situations they've coped with, and they can empathize or relate with a character, have their heart twisted ect... To put it simply, it doesn't leave readers indifferent, and a majority unconsciously- if not likes, at least doesn't dislike these stories this much.
Personally speaking, I hate Netsuzou Trap because it's complete shit. There are lots of better, and several good or even great stories involving cheating / love triangle / ntr; don't know why people enjoy this one out of every other this much.