Sure, Yaoi manga is very real. It typically focuses on romantic and sexual relationships between male characters. These mangas are created and consumed by many people around the world.
Manga porn is basically adult-oriented manga that contains explicit sexual content. It's very different from regular manga, which can cover a wide range of genres and themes without that kind of explicit stuff.
A hole in the wall porn manga often features graphic sexual scenes and may push boundaries in terms of vulgarity. Such content is often not suitable for public consumption and may have negative impacts on viewers' minds.