The inclusion of sex and nudity in video games has been controversial since the early days of the video game industry. While many video games have used scantily clad images or characters to sell or enhance games, some go further, using sex acts or nudity as a character motivation that is, the reason for a character's behaviors and actions , in-game reward, or simply as a gameplay element. These games originate worldwide, on most platforms and can be of any video game genre. While releases in Europe and North America have been sporadic and often unlicensed, Japan has seen the emergence of a pornographic video game subgenre— eroge , first appearing on the NEC PC computer platform in the s. One of the earliest video games if not the first to feature sexual themes was the text-based Softporn Adventure , published by On-Line Systems for the Apple II. In a article in Time Magazine , On-Line reported that they were making a version of the game for straight women, though this never materialized.