Some questions and answers on this site contain potentially objectionable or NSFW images. Mostly depictions of nudity in art or artifacts.
The SE Content Policy:
Sexually Explicit Material. Accounts that use Stack Exchange to post sexually explicit or pornographic material, or links to it, will be suspended.
Given this discussion: What is the network policy on questions involving adult themes?, not to mention the couple times Sexuality.SE has been tried, there seems to be fair bit of leeway for communities to determine their own limits, within reason.
Should these images of nudity or objectionable content in art be censored, hidden in a spoiler block, or what?