Night Life was a 1982 erotic

Eroge

An or Ero-ga is a Japanese video or computer game that features erotic content, usually in the form of anime-style artwork. Eroge originated from galge, but unlike galge, they feature erotic/pornographic content.-History:...

 graphic adventure game

Graphic adventure game

A graphic adventure game is a form of adventure game. They are distinct from text adventures. Whereas a player must actively observe using commands such as "look" in a text-based adventure, graphic adventures revolutionized gameplay by making use of natural human perception...

 by Kōei, released for the PC-8801 computer.

Summary

It was the first commercial erotic computer game

Adult video game

An adult video game is a video game which has significant sexual content , and are therefore intended for an adult audience. Adult games can fall into many genres and have diverse gameplay.-PC and console:...

, featuring sexually explicit images, and a precursor to the modern bishōjo game

Bishojo game

A , or , is "a type of Japanese video game centered on interactions with attractive anime-style girls". These games are a sub-genre of dating sims targeted towards a male audience....

 genre. It was released in April 1982. Night Life was marketed as an aid for the sex life of couples. It included such features as a schedule to determine a woman's period

Menstruation

Menstruation is the shedding of the uterine lining . It occurs on a regular basis in sexually reproductive-age females of certain mammal species. This article focuses on human menstruation.-Overview:...

, and a catalog of possible sexual positions, with artwork consisting of black-and-white outlines.