There is a soft tag built into the post itself: the title. It says “Ikkitousen.” If you know what Ikkitousen is, you know it’s an ecchi anime. If you don’t know what Ikkitousen is, you have to decide for yourself if the post is worth opening blind. On an anime community it should come as no surprise that people would post characters from ecchi (and not necessarily hard-defined NSFW) shows.
Though I don’t disagree with your suggestion for having more user control, the root of this is entirely a personal problem that others shouldn’t be expected to accommodate for you. Go into your display settings and turn off thumbnails and be self-policing in what links you click on.
I installed it a week or so ago… it was alright. Didn’t care much for the DE animations, switched back to Mint the same day. Good for the lulz (and on-demand waifu pics).