It's not really the Manga world, because then you wouldn't have hentai, or yuri, or even yaoi. However, it's the company or website that they show their comic on, having rules and regulations regarding censorship. Also, the countries own laws regarding it as well. Take, America's censorship, you can't curse, you can't show nudity, and you can't even show violence in cartoons, because it's bad influence on the children when the "children" are growing up beating, and killing each other regardless of their "censorship". Manga go, doesn't have any rules on censorship as long as it's credited, and not too offensive. It's just getting someone to redraw the censored parts is the problem. Keep looking and you will find some uncensored gems out there. (▰˘◡˘▰)
why are privates parts taboo in the manga world? but yet you see manga with pedophilia in it (not this manga btw just an example). im so confused.