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.
However, there are also many other gameplay genres represented within eroge, such as role-playing games, mahjong games, or puzzle games.
Some eroge, such as those made by Illusion Soft, are just simulations of sex, with no "conventional" gameplay included.
As with yaoi manga, the major market is assumed to be female.
Games aimed at a homosexual male audience may be referred to as bara.
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.
In 2006, JAST USA announced they would be releasing Enzai as Enzai: Falsely Accused, the first license of a BL game in English translation.
Some fan communities have criticized the choice of such a dark and unromantic game as the US market's first exposure to the genre.
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.