For decades, the art associated with anime and manga, including hentai works, was drawn by hand and required traditional skill. When computers advanced to the point where full 3D computer generated animation was possible, it was, at first, cost prohibitive, and only large studios could invest in it. Eventually the technology trickled down to the home user, and doujin circles were quick to pick up on it. Combine this ability with easily scriptable engines like Flash, Renpy or Buredo, and you have the foundation for a new and growing market for 3D hentai computer games.
The number of 3D hentai games being produced by Japanese doujin software companies seems to be on the rise. Most are created in the adventure game format, and while some are little more than interfaces that allow the user to click through a simple story or animated clips, there are a few that show that the genre is growing in complexity as much as in number. Some of the top selling 3D hentai games boast many gigabytes of data, hours of story and animation that rivals anime theatrical features. These are rare as they may take up to a year to produce. Still, the market is ever expanding because of the accessibility of 3D. Hentai games are, as a result, gaining an ever increasing audience of satisfied fans.