If you come to Fetish and Sexuality Central and suddenly can't find your favorite thread, ask yourself, did any of the content break the Forum guidelines as outlined below, AND in the sticky at the top of the front page of the forum? If so, then it's likely been deleted.
Edited to add:
As of today, 11/15/13, Laurel is slowly closing down existing threads with more than 5,000 posts. These threads are still readable, you just won't be able to post on them. Here's her explanation:
To alleviate server load, we're slowly closing down any threads with over 5,000 posts. You are free to continue this topic as a new thread. Should you do so, please PM me with a link to both the old and new threads, and I will place a link in this post so that others who follow this thread will be able to find the new one.
As annoying as this may be, phasing out all or most of the active super-long/never-ending threads will increase the forum speed substantially. If you see a thread that's active with more than 5,000 posts, please feel free to PM me with the link.
Please note that these threads are not being removed - just closed to new posts.
Thank you for your patience and kind understanding!