Curvy is an adult webcomic, not a porn archive, and that distinction is the whole point. Written and drawn by M. Magdalene since 2008, it describes itself as a spicy saga for adults only, and it follows a sprawling cast through interlocking fantasy and science-fiction storylines, from mythology-inspired arcs to chapters set in other worlds. The sex is explicit and frequent, but it belongs to characters you come to care about, which puts Curvy in a very different league from the gag-a-day strips and scanned doujinshi that fill most comic porn sites.

The archive is deep. More than thirty distinct story sections sit in the chapter navigation, built up over nearly two decades of weekly pages, and the art has evolved from simple early panels to confident, expressive sequential work with a strong sense of colour and body language. Characters are drawn across a range of genders and shapes, with the curves the title promises front and centre. New pages go up every Saturday, and each one carries a reader comment thread, so Curvy has a lively community arguing about plot twists and favourite pairings. An RSS feed and social sharing links make it easy to keep up without checking back manually. The archive is organised by chapter, so catching up on eighteen years of pages is less daunting than it sounds.

Reading Curvy is completely free, with no paywall, no login and no pop-up ads of the kind that plague the big comic aggregators. The comic is supported instead by an online store selling books, prints and merchandise, and by the Curvy Scouts membership programme for readers who want to back the artist directly and get extras in return. That is the whole pricing model: pay if you want to, read regardless. The site is a simple, fast-loading page that works well on phones, and there is nothing to install or subscribe to unless you choose the membership. Loading is instant and the pages are large enough to read comfortably on a tablet.

Our verdict: if you like your erotica with a plot, Curvy is one of the best long-form adult comics on the internet, and it costs nothing to find out. Start at the first chapter rather than the latest page, because the story rewards reading in order and the early arcs set up everything that follows. Few comic porn sites can claim a single unbroken story of this length, and fewer still make you care about who ends up in bed with whom. Open it through our link and settle in for a long, filthy, surprisingly moving read.