No. It doesn't seem like a common type of story at all. I've never heard of it in mainstream literature or storytelling, so it's likely something very specific or perhaps even a made - up or very niche concept.
No, this is not a normal statement in any known mainstream culture. It seems to be an expression that is either made up or very specific to a very unusual or inappropriate context.
The term 'wife extreme insertions story' is quite ambiguous. It could potentially be a title of a very specific piece of literature, a movie plot in some extremely rare or alternative genre, or even just a random phrase someone made up. There's no way to accurately define it without additional details like the origin or the context in which it was used.
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.