Night Life
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Night Life was a 1982 game by Kōei for the PC-8801. It was the first adult game to be released in Japan, a precursor to the modern bishōjo game.
Night Life was arguably not really a game at all: it was marketed as an aid for the sex life of couples. It included such features as a schedule to determine a woman's period, and a catalog of possible sexual positions. With artwork consisting of black-and-white outlines, it was not very erotic.