Eroge gameplay is often in the style of a visual novel or dating sim.
However, there are also many other gameplay genres represented within eroge, such as role-playing games, mahjong games, or puzzle games.
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.
More and more people who used to reject such type of games began to become more open-minded that it isn't just about sex anymore.
There is no set definition for the gameplay of eroge, except that they all include explicit sexual content.
To Heart's music was so popular it was added to karaoke machines throughout Japan—a first for eroge.
After a similar game by Tactics, One: Kagayaku Kisetsu e, became a hit in 1998, Visual Art's scouted main creative staff of One to form a new brand under them, which became Key. It contains only about seven brief erotic scenes in a sentimental story the size of a long novel (an all-ages version was also released afterward), but the enthusiasm of the response was unprecedented, and Kanon sold over 300,000 copies.
Early eroge usually had simple stories, some even involving anal sex, which often led to widespread condemnation from the Japanese media.
Some eroge, such as those made by Illusion Soft, are just simulations of sex, with no "conventional" gameplay included.
Boys' Love (BL) games (also known as yaoi games) usually refers to eroge oriented around male homosexual couples for the female market.
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.