Use Lemmy Explorer's community search, setting it to "NSFW Only".

When doing this, it may be better to do [![][1]][1], then later in the post do [1]: {image url}, replacing 1 with different numbers for each image, in accordance with this

This allows people to click the image as a link and open it full-size.

Check the source of https://lemmynsfw.com/post/9361 for an example.

I just made !nsfw411@lemmynsfw.com with the intention of using it as an organized catalog of communities, categorizing them by type. Feel free to post any communities and the categories they may fall under. The communities also don't have to be specifically on lemmynsfw.com, they could also be from other lemmy instances or maybe kbin instances.

If anyone wants to help with the categorizing, message me or reply.