The Case of the Shunga Escapade.

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Shunga (春画?) is a Japanese term for erotic art. Most shunga are a type of ukiyo-e, usually executed in woodblock print format. While rare, there are extant erotic painted handscrolls which predate the Ukiyo-e movement.[1] Translated literally, the Japanese word shunga means picture of spring; "spring" is a common euphemism for sex.
en.wikipedia.org/wiki/Shunga