I guess some of it comes down to personal experience: in my case, I found violence to be a much more real and bothersome matter, and when I was younger I simply wasn't interested in things like nudity. Regarding the matter of swearing, I think I'd heard all the familiar vulgarity before I was even into my teens, much of it from the other kids! And it seems to be much more commonplace these days, for better or worse. Of the things you'd mention, bullying is probably the worst of all and it can use pretty much "all of the above" in its application.
