In the information provided, there was no specific description or related content about the running leg picture. Therefore, I don't know what a picture of a running leg looks like.
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.
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 point of the split-leg sitting was to support the body vertically through the parallel bars, and then through a large swing, the body's legs and feet were higher than the parallel bars. Then, he quickly spread his legs and sat on the parallel bars while his body descended, completing the sitting position.