Same here with Flickr. I can only imagine one of the bigger draws to Flick were the adult themed photographs. Their loss.
At the beginning of the forums is User Support. In there is Rules and Pornography. That's a good thread for the rules.
Great info to bring back into circulation. I have done many postings with Reddit. I am sure many still exist. Only posted once on a video site. I am sure it is long gone.