Fans of Japanese BDSM may want to check out SMpedia. Based on a machine translation of their front page it’s ‘a non-profit database established to accurately convey the process of the birth and development of post-war Japanese SM culture to future generations.’ I have absolutely zero ability to read Japanese, but the modern browser translate tools seem to do a pretty good job to convey the gist of its pages. There is an English language version known as Nawapedia, but there’s a lot less content and it doesn’t appear to be being updated.
The artwork below is from the site and by 小悪征夫, which Google translate as Yukio Koaku.
There is also a twitter feed for the site, which is where I spotted this image.