I swore like a sailor once I learned them in fifth grade. Then I realized how dumb it sounded to say them so often and it gradually died down to the point where some of my new friends were convinced that I don't swear at all. I'd have to say the one I use the most is bullshit, mainly because me and my friends bullshit all our assignments at the last minute.
One of my obsessive-compulsive tendencies is an aversion to strong lanuage. This makes writing stories tricky at times because the characters do not always have such misgivings. It's not so bad in a comedic setting, though, because I can work self-censorship in as part of a gag.
I swear quite often in my head, actually, quite doesn't even suit the description, but not so much in speech, even if I try. The cat's always got my tongue when I try to be a badass and curse. Although, I have had most ease saying "bitch".
I swear when I'm pissed. Yesterday my browser started bugging so I freaked out and a lot of swear words came out accidentally.. I use "fuck" and "shit" in English very often too but not when I'm angry, just like a habit.
For some reason I swear much more when speaking English, I say 'fuck' and 'shit' a lot, mainly as exclamations While when speaking in my mother language I don't really swear a lot, I had a peak in my teenage years that then calmed down xD
I swear depending on my mood. Just happens automatically, but I use words like "cripes", "crap", "darn", "damn" and "S of the bees". But then if its about something a bit worse, graver or my mood is a little bit sideways I'd be using words like "shite", "shit", "son-ofa-bich!!!" And worse situations or moods call for worse swear words etc etc
I don't necessarily like to swear, considering it's a sign of grief... I guess it can convey significance as an adjective sometimes, shrug. I never liked saying or hearing Goddammit, but sometimes I like to say I fucked your virgin mother.