Often there might be themes related to character development in a negative way. For example, a character might be made to face their weaknesses in a very public and demeaning manner, which could lead to a change in their personality, either towards more self - loathing or a drive to prove themselves in an extreme way.
Humiliation fiction refers to a genre of fictional works that often involve themes of humiliation. It can explore the psychological and emotional aspects of characters being humiliated, which might be used to create drama, tension, or to make a social commentary.
Well, it's hard to say for sure. The concept of 'porn-like' is quite subjective. Some might consider certain novels with excessive sexual descriptions as such, but it depends on individual perspectives and cultural standards.
In many places, 18+ porn comics are considered illegal. This is because they can have a negative impact on society and violate moral and legal standards.
The main distinction of porn with a story genre from regular porn is the presence of a coherent narrative. Regular porn often jumps straight to the sexual action, while the story genre tries to add some kind of story framework around it. But in the end, both are adult-oriented and feature explicit sexual content.