Private lesson: Meiki kyôiku

Original title: プライベートレッスン　名器教育

A virgin, a married woman, a career woman, and the progress is made by combining the abnormal sex of each of them. This is Rumi Tama's first work in 1983, which can be called the Japanese version of the Decameron, and is a female writer who has made a point of creating enjoyable pornographic entertainment without logic.