Boyd: In all honesty, penis should probably be on the forbidden list.
The truth is, if we could trust all users to use language appropriately, we wouldn't need to have a lst of forbidden words. Unfortunately, history shows that is not the case. Too often, posters resort to swear words, even inserting symbols to get around the censor. Long-term users can probably remember some of the extreme offenses that have occurred over the years with trolls and others using language that would make a Marine blush. That's why the system is the way it is and will stay for the foreseeable future.
Cheers, Aaron