Yea. Saph, you and I could never get along in person, ever.
I have tempered my mind to the point where most profane words cone out as readily, and guiltlessly, as any other words in the English langauge. The way I see it, the world is so messed up, in so many ways, that there's really no other words that can accurately describe my feelings about them than those that are not profane. Yes, so it may seem hollow, or immature, but to my mind, a profane word is little more than an expression of a rather strong feeling. On internet forums, if swearing is frowned upon, I won't do it. However... let's just say that there'd be about 3 or 4 explitives in the preceeding paragraph if I read it aloud.
That said, explitives that berate people based on physical characteristics (race, gender, etc.) do NOT come out of my mouth, at all. Ever. Those actually do offend me. That said, there's generally more than enough of the "other" explitives in my speech.
As for movies where swearing is vital, I'd say that a documentary on someone with Tourette's syndrome (if it existed) may fit that quality. Any movie that attempts an accurate portrayal of, say, the street life, or any other underground activity would not be accurate at all without profane dialouge.
Violence? For me, the line between what's entertaining and what's disturbing is so incredibly obscured that I can't quantitate it. At all. In general, unnecessary violence is more likely to disturb me than that which is essential to the plotline. A movie that's basically a slasher-fest does not interest me at all, not because the violence offends me, but because the plot is usually terrible and uninteresting to me.
I have no ideal rating. There's G movies that exist that I find amusing. Likewise, there's R rated movies (Maybe even NC-17? Haven't seen any of those, though) that I find entertaining.
Oh. Right. Reading. The Theory of Interest, by Stephen Kellison. Actuary stuff. You know.