Dream of the Fisherman's Wife by Katsushika Hokusai

Title:Dream of the Fisherman's Wife
Artist:Katsushika Hokusai
Country of Origin:Japan
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This bizarre and disturbing painting by Hokusai is reminiscent of so-called "tentacle pornography", which is now rather common in Japanese hentai. The graphic painting depicts a nude female engaging in sexual intercourse with an octopus. This suggests that the concept in Japanese culture goes back to at least the early 19th century.