I'm with Sweeney, this thread is pretty sad. I don't find it funny, just disappointing.
But to answer the original question, when I was a child I would not swear because I didn't want to be in trouble. When I was a teen I would swear in context, not excessively and never around my parents, teachers of elders out of respect. Now, I try to control my mouth, because I see vulgarities as a lack of self control which is unbecoming of a lady. However, I can't always be ladylike...
I do not use vulgarities around my children. It isn't fair to them for me (or anyone) to expose them to that. My oldest (3) is just now beginning to grasp the concept that there are some things that should be kept private and some things that should not be said around certain people. Even so, she doesn't understand why that is, and I don't think that is something that can just be told to someone as a lesson. This type of awareness is developed over time (though unfortunately not as well for some as it is for others...).
Just came back to add that I actually do enjoy swearing when it is used like a sprinkle of flavor, not when it smothers everything though. Then it is just boring.