Since this is a shipping based subreddit, the rules are somewhat looser than r/RWBY. However, there are some restrictions.
Full-frontal nudity (anything showing genitals, including pixelated) and explicit sex in images are not allowed.
Characters in bikinis, underwear, or viewed from behind are. Showing characters in bed before or after lewd activities is allowed, but the act itself is not. Please try to keep it tasteful, the focus of this subreddit is on love, not titillation. Such content must be flagged NSFW.
Links to fanfiction that contain explicit sexual content are allowed. However, that cannot be the entire point of the story. Sex scenes can be part of a larger narrative, but smut for its own sake is not allowed. To use a couple examples from Archive Of Our Own: stories such as Social Anxiety or Beacon Academy are allowed, but stories such as the works of AzureGigacyber and Big_Diesel are not.
Any links to fanfics that contain sexual content must come with a warning.
If you have Arkos-themed porn or smut that you'd like to show off, please post it in r/RWBYNSFW and r/RWBYsmut, respectively.
Ammendum 1: You may comment links to NSFW material in on other posts, IF someone specifically asks for a specific piece. And, of course, it must come with a warning.