Peter,
I'm with you on this one. Sure, I'll use an occasional d***, but I can honestly say that I don't use the stronger four-letter words that are all far too common nowadays.
The GC I work with regularly is pretty bad, and when he gets together with some of the other regular brick-layers, plumbers, etc. there have been times when it seems like every other word is a profanity.
I grew up in a family where swearing was mild and kept to a minimum, and I'm thankful that that influenced me to be the same way.
I sometimes cringe at the language parents use today not only in front of, but sometimes directly to their own kids.
Yes, I'm certain that Hollywood and TV must take a fair share of the blame (and that includes British TV/films which are just as bad, if not worse). I know I'm just one of many who will now refuse to watch late-night TV for this very reason.