The extravagant fantasies of sex in Edo Japan have long been known as one of the most surprising characteristics of the era and keep amazing modern readers. You can now browse these impressive pictures online in 近世艶本総合データベース by Ritsumeikan University:
http://www.dh-jac.net/db13/ehoncatalogue/about.html
The database collects 2,995 titles of Enhon, or erotic texts, from Ritsumeikan University, Nichibunken and the British Museum, among others, with 429 digitized items.
For the texts with English translations, see Nichibunken Collection of Erotic Texts of the Early Modern Period:
http://www.nichibun.ac.jp/~montah/
Photo: 烏亭焉馬(作)、歌川国貞(画)『文盲我話』1826。
