What Makes This Different From Hentai or Manga
Porn comics are static, panel-by-panel sequential art, closer in format to a Western comic book than to an anime episode. Some are drawn in a manga-influenced style, but plenty use a distinctly Western comic aesthetic, especially the huge sub-genre built around parodies of superhero comics, sitcoms, and video games. The appeal is different from video too - a comic can dwell on a single image, build a narrative with actual pacing across pages, and give an artist full control over anatomy and detail in a way live footage can't. Multi-chapter comics can also develop ongoing storylines and running characters over dozens of releases, closer to serialized fiction than a one-off scene.
Terminology You'll See
'Doujinshi' technically refers to self-published fan comics from Japan, but the term gets used loosely by English-speaking fans for adult fan comics generally, even outside Japan. 'Parody comic' describes work based on existing characters or franchises. 'Original' distinguishes creator-owned stories and characters from parody work. You'll also see artists referred to by name constantly in this space - unlike a lot of adult content where the studio or site is the brand, porn comics are heavily artist-driven, and fans follow specific artists across whatever site currently hosts their work. 'Colorized' is another common tag, describing a black-and-white comic that's later been fully colored, sometimes by a different artist than the original line-art creator.
Where the Format Comes From
Adult comics have existed in various underground forms for a very long time, but the modern online porn-comic scene really took shape with the growth of image-board and forum communities in the 2000s, where independent artists could post work directly to an audience without needing print distribution. That direct artist-to-audience pipeline is still the backbone of the genre today, just moved onto dedicated hosting sites, artist Patreons, and comic-specific platforms instead of forum threads. The rise of crowdfunding and subscription platforms in the 2010s gave individual artists a way to fund larger, more ambitious comic projects than a forum-based hobby ever could have supported.
Why Fans Follow Artists, Not Just Sites
Because style varies so much from one artist to the next - anatomy, coloring, storytelling pacing, character choices - a fan's loyalty in this genre usually attaches to a specific creator rather than to whichever site happens to host the work this month. That's the main reason porn comic sites function more like aggregators and discovery tools than exclusive content sources: the real value is in surfacing artists whose style matches what you're looking for, then following that artist directly wherever they choose to post or sell their work next.