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-88 computer platform in the 1980s.
In the 1990s NEC (on the PC Engine series and PC-FX) and Sega (on Saturn) were the only companies who officially allowed sexual content on their consoles in Japan, but eroge was more prevalent on the NEC PC-98 and FM Towns computer platforms.
Once the scenes are unlocked the top door is open where the player can go and engage in a controllable sex scene letting the player have intercourse with a woman until the player reaches orgasm and the game is over.
Also released in 1984 was Strip Poker: A Sizzling Game of Chance for the Commodore 64 which was created by Artworx Software.
X-man features the player as a nude man working through a maze toward a pink door in the center, past antagonistic crabs, teeth and scissors.