Ok, I have no problem with the fact that you want to keep out certain curse words due to the number of teenagers on the site. However, when the letter combination is actually part of a bigger word, than why is that censored? It's not like the bigger word is a curse word. This can and does at times mess up links and images that are posted.
It only messes up links that contain those words in the same context as they would be filtered in posts. The filter has been discussed ad nauseum, and is not goinh to change. The support for offsite links is NOT a top priority of the site.