there is a lot of variance in how much people swear. i'd say only 10% are people who never cuss.
i swear a ton, but i like to think that i exercise good tact unless i'm pretty drunk. i really enjoy sophisticated old people who can talk for several hours without a cuss word and then blow the doors off the conversation with a "i don't give a crap about what that rough ridin' coward says...."
yes, a well placed eff or curse word when it has that shock and awe is the best.. if its just someone going sailor its really awful