Greg's right, that's how I was led to understand it too (however, While I knew they existed, my Teacher never taught me them XP)
Although, Certain words (which she didn't teach me either) were also said to not be Swears, but properly translated as such.
IE, Kuso is a vulgar word for Excretement, Poo, so Crap or Shit is, in context, proper for it.
Kisama is a Vulgar way to say "You", most people translate it as Bastard or Bitch, Along Wtih teme.
Yarou is one I've heard and seen translated as "Asshole", not too sure on that one, but I see almost everyone translate it that way, including actual Anime And Manga Companies, so I want to believe that's an accurate translation.
Unfortunately, I've not got a wide knowledge of these terms, because my Teacher purposefully never taught me the curses, so I had to "Learn" them from Anime, but she considered Those Curses (I asked her one day, and Cited these ones I'd seen in anime As Examples) and she's a born-and-raised Japanese woman.
There's also Context, I mean, if you get sliced by a sword and are bleeding profusely (a Situation Zoro finds himself in quite often) would you say "Darn you you meanie" or "Damn you you Bastard"?
I mean, Large ammounts of Blood are already present, and those are considered Very "Adult" so why do people not like Cursing?
So, I'll end with an appropriate Quote from the South Park Movie:
"Horrible Deplorable Violence is OK, as long as nobody uses any dirty words"