It is only in relatively modern times, specifically the Victorian era that this was so.  Like it or not, vulgarities, slang, whatever you want to call it are a part of our vernacular and always have been.  In fact, many have a longer history in our languages than most  so called proper terms.  I remember when I was with the Franciscans and the old Friar who taught us pointed out that in one story St Francis told a novice who was being bothered by a vision of Christ that Francis knew was actually the devil.  Francis told the novice (according to our book) to tell the devil to open his mouth so the novice could empty his bowels in it.  The old Friar teaching us laughed and said the original Latin was much more graphic.  And this was in one of the official lives of St Francis from the Middle Ages.  The same Friar told us that an uncensored version of most medieval sermons if properly translated would be condemned by the modern church as too filthy.