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.
It might also be a story that is so honest and raw that it feels like it's laid out completely exposed, without any pretense or sugar - coating. For example, a memoir that details a person's difficult upbringing without trying to make it seem more palatable than it was. The author bares their soul, so to speak, and shares their experiences in a very unvarnished manner.
Naked fiction could refer to a type of fictional work that is very raw and unadorned. It might lack the typical trappings of more commercial or mainstream fiction, like elaborate world - building or highly stylized language. It gets straight to the essence of the story, presenting characters and events in a more basic, stripped - down form.