I learned an interesting fact from my father's doctor when he was being treated for a stroke. Mom had mentioned that even though Dad couldn't speak well enough to ask for a glass of water he could clearly say, "Goddammit". The Dr. explained that epithets are from a different part of the brain and this area had not been affected by the stroke.
I found this very interesting. Although, in the case of my father, I had never heard him utter the the "F" word, I had heard him salt his language with "G'D!" all my life. In his upbringing the f-word was considered vile and no respectable person would let it cross their lips and it had not become a part of his brain.
At about 35 yrs old, when my brain finally left the WTS, is when I began to use the F word. It was, I think, a way of showing my contempt for being duped. That was 20+ yrs ago and now, I'm afraid my brain's hard drive is forever contaminated. The word seems to pop out of my mouth in moments of surprise, like when hitting my thumb with a hammer.
I hear people casually use the word and I find it off-putting. Then I remind myself that I say too. I think I have enough control and awareness not to use it in an inappropriate situation, like a formal business meeting. But I wonder what would come out of my mouth if I knocked over a cup of coffee into my laptop during the meeting?