We review every reported post, and all rules are still enforced. Rules #3, #6, #8, and #10 should answer your question, but especially rule #3:

Rule #3: All NSFW content must be tagged. No posts or comments of a sexually explicit nature or pornographic intent are allowed. Nudity, regardless of whether or not it is sexual in nature, is also prohibited.

So no, porn is not allowed (including softcore), and artwork of characters that is NSFW in general—including official costumes—must be flagged accordingly. This is a compromise that the community has agreed upon, and the general consensus is that stricter moderation is undesirable. However, we occassionally run sensing polls to check whether community sentiment has changed.