Hentai
Most of the hentai (anime)-films in the late 1990s to the present day are based on Ero-Games, where the only actual goal is to date the girls in the game and have sex with one of them. The games feature various character-types, like a bookworm, a tough girl, a younger girl, and a tomboy. Ero-games can include highly taboo themes, such as coprophilia or dismemberment, pedophilia, and rape. Sometimes slightly less taboo subjects, such as incest. Some examples of these kind of game-to-hentai-anime conversions are Immoral Sisters, Isaku, Pia Carrot, Five Card, Bible Black, Words Worth, Night Shift Nurses, Huniepop, and Milk Junkies.