It's so funny...human nature, how we express ourselves and how others perceive us. Hearing you explain why you curse gives me a totally different take on it. I've never thought about it that way before. Brutal honesty!
I rarely curse. I have to be out of my mind angry to let the expletives fly. To me, the English language is full of so many wonderful words! The more I'm familiar with, the more accurately I can express exactly how I'm feeling at any given moment. I've always found a person who punctuates every sentence with a curse word to be grammatically lazy. When I listen to the guys I work with, I'm so distracted by the shear amount of f-bombs they can squeeze into a very normal conversation, that I have a difficult time even understanding what they're getting at. And then the curse word loses it's power somehow, and doesn't even mean anything anymore.
It's not that I'm a prude, when I'm red-hot angry I think it's very acceptable to illustrate this with well-timed cursing meant to deliver a message.
However, it's interesting what you said about the correlation between cursing and honesty. Not sure why they go together, but interesting nonetheless.
Learn something new every #$%&ing day!