I was suprised when in SA recently to be sat watching an extremely violent(as they are) Quentin Tarrantino film in the early evening (about 7) with none of the violence edited out, but all the swearing, even the minor stuff, dubbed out, which as you can imagine with a Tarrantino film did disturb the flow somewhat!!
It seemed a very bizzare indication of what a culture considers reasonable for young children to potentially see and what people might find offensive!!
It's ok to torture someone or blow someones head off or have them ripped apart alive by dogs, and show it on TV, but just don't swear while your doing it!!!