There is no set definition for the gameplay of eroge, except that they all include explicit sexual content.This most often occurs as hentai scenes of the player character having a sexual encounter with other characters.Boys' Love (BL) games (also known as yaoi games) usually refers to eroge oriented around male homosexual couples for the female market.The defining distinction is that both the playable character(s) and possible objects of affection are male.Soon, new genres were invented: ASCII's Chaos Angels, a role-playing-based eroge, inspired Dragon Knight by Elf and Rance by Alice Soft.In the early 1990s eroge games became much more common.In 2002 a 13-episode anime series was produced, as well as another 24-episode anime series in 2006.
Competing systems included the Sharp X1, Fujitsu FM-7, MSX, and NEC PC-8801.
In some of the early erotic games, the erotic content is meaningfully integrated into a thoughtful and mature storytelling, though others often used it as a flimsy excuse for pornography.
Erotic games made the PC-8801 popular, but customers quickly became tired of paying 8800 yen () for such simple games.
Eroge was much less common on consoles - only NEC's PC Engine series had officially licensed adult games, and from the mid-90s, Sega's Saturn.
Both Nintendo and Sony disallowed adult video games on their consoles.