She kissed her own son. That is technically not her son ( adopted) but also with not her real body. But she still kissed him. So is this incest or not?
The translations of the title is different from the original title. I’m not sure why, maybe it is cause it’s a idiom of some sort? Even the official English also has the same title. So the title didn’t literally meant that only cheating MEN must die or something.