I remembered slightly incorrectly
Pornography and potentially offensive material. Do not post links to pornography – we will be the judge of what constitutes pornography. Links to nudity or other potentially shocking or offensive material are permissible only in the context of a mature discussion – gratuitous posting of such links is grounds for revocation of your posting privileges. When posting a link to potentially shocking or offensive material, observe the “two click” rule – don’t link directly to the item, but rather to an intermediate page that in turns links to the item. Alternatively, you may use the “spoiler” function – highlight the link, click on the Tool (gear) icon in the posting menu, and click on Blur Spoiler. Then provide an adequate, accurate description of what the blurred link points to. If you’re not sure whether a link is appropriate, contact a moderator or administrator before posting it. Any user who feels a posted message is objectionable should flag it or contact the moderators of the affected forum by private message.
Note “Links to nudity or other potentially shocking or offensive material are permissible only in the context of a mature discussion” which would have forbidden a few threads at least, including my favorite.
ETA
From here- I honestly forget if the rules have been significantly updated since this
SDMB rules have been further reorganized. A draft restatement is provided below for comment.
Please note:
We have attempted to eliminate redundancy and consolidate all rules on one topic in the same place.
Rules are organized alphabetically by topic.
Cross references are provided where appropriate. The message board software does not support intra-post hyperlinks, but lookup is reasonably easy using search.
We have put a few informal rules in writing – see for example “artificial intelligence…