Since we have the extra Adult+ rating, I feel like the artistic nudity should be in the Adult section, and the hardcore stuff in Adult+.
The reason for this is I feel the wording for allowed nudity in Moderate is a slippery slope, when does it cease to be artistic and become designed to elicit more "sensual" thought?
If it moves to adult, this becomes less of an issue. I keep finding myself questioning if a post in Moderate qualifies as artistic or not.
I also think sexually explicit should be defined a bit, I keep seeing several posts that to me, go beyond mildly explicit and become far more. average bikinis, short micro minis and low cut tops are one thing, I'd expect to see those in Moderate. Barely there dental floss swimwear and lingerie and see through clothing should fall under adult since we have an extra rating SL it's self does not have.