We're falling into a prudish dystopia where even the sight of a nipple or belly button can send people into a frantic riot over censorship if those things aren't attached to a specific type of body. A nipple isn't inherently porn, neither is a spiked strap, or a foot, or a belly, or whatever.
Hell Toupée₊°｡🦴I'm TOTALLY COOL with people finding my kink stuff sexy. I even find that flattering. As a very ace person who doesn't experience sexual arousal, it's cool that my kink art can hit in a certain way for others. But that doesn't inherently make it pornographic. My intent is not to create porn.