Most eroge games, a fairly large library, found its way on the NEC PC-98 platform.
FM Towns also received many games, more so than Sharp X68000 or MS-DOS, whilst the MSX platform (which had many eroge games in the 1980s) was nearing the end of its lifetime by now.
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.
Competing systems included the Sharp X1, Fujitsu FM-7, MSX, and NEC PC-8801.
NEC was behind its competitors in terms of hardware (with only 16 colors and no sound support) and needed a way to regain control of the market. The first commercial erotic computer game, Night Life, was released by Koei in 1982.
Early eroge usually had simple stories, some even involving anal, which often led to widespread condemnation from the Japanese media.
Although many eroge still market themselves primarily on sex, eroge that focus on story are now a major established part of Japanese otaku culture.
Oftentimes, voice actors who have voiced for eroge have been credited under a pseudonym.As with yaoi manga, the major market is assumed to be female.