Nobody has really answered this, and the discussion has deviated. The thread will be closed unless discussion gets back on track.

The word is not blocked simply because it's not an offensive word. The point of the filter is to block words that many people find offensive. Actually posting pornography would not be allowed, but there is nothing wrong with mentioning it or talking about it as long as the discussion is kept fairly clean. Analogous would be blocking the word "murder" because murdering is illegal - which would obviously be ridiculous.