We had simplified our rules down a couple years ago and one element got left off by accident. It hasn't been a major issue, but recently we've been noticing more and more use of profanity in posts.
I have now updated the rules and added it back in.
It's now back into #1:
1. Posts, avatars, and signatures may not contain: profanity, flaming, personal attacks, nudity, spam, rants, debates, politics, negativity, fund-raisers, or advertisements.
P.S. We don't have any tolerance for any member that skirts this rule (and avoiding the filters we have in place) on purpose by various means or loopholes.