Like with Koei, several other now-famous Japanese companies such as , and also released erotic adult games for the computer in the early 1980s before they became mainstream. Early eroge usually had simplistic stories and extreme sexual content, such as . These factors often led to widespread condemnation from the Japanese media. In some of the early erotic games, the erotic content is meaningfully integrated into a thoughtful and mature storyline, though others often used it as simply an excuse for pornography. Erotic games made the PC-8801 popular, but customers quickly tired of paying 8800 yen ($85) for such simple games. Soon, new genres were invented. ASCII's a eroge, inspired titles such as by Elf and by .
With and multimedia based games in the 1990s, most adult games featured video clips with limited interactivity. Both pre-rendered and real-time 3D graphics were also used. While most games could be considered nothing more than , some attempted to include actual story and plot. This can be seen in some games with less explicit content, equal to an R or PG-13 rated movie.
A new generation of adult social games has emerged that bring multiple users together in sexual environments. Examples include and . While it is not explicitly intended for purely adult-oriented entertainment, the virtual world of , which is made up almost entirely of player-made content, has an array of very exotic adult entertainment including nudity and full-on sexual activities.
Adult games may take the form of , circumventing mainstream publishers who may have policies against such games. or to mainstream non-adult games may add sexual and pornographic themes, mostly for , especially when sexuality was never intended in the original game. Examples include the video games, the , and , (which both have multiple such mods), 's FakeFactory Cinematic Mod and hacks for console .