The Dream of the Fisherman's Wife

The Dream of the Fisherman's Wife (Japanese: 蛸と海女, Hepburn: Tako to Ama; "The Octopuses and the Diver"), also known as Girl Diver and Octopi, Diver and Two Octopi, etc., is a woodblock-printed design by the Japanese artist Hokusai. It is included in Kinoe no Komatsu ('Young Pines'), a three-volume book of shunga erotica first published in 1814, and has become Hokusai's most famous shunga design.

Source: Wikipedia — The Dream of the Fisherman's Wife (CC BY-SA 4.0)