The first time I heard of Stephenie Meyer was way back when I first discovered blogs. She'd done an interview in which she explained that she wouldn't include premarital sex in her books because it was against her (LDS) principles. I followed up with an article in which I argued that (in my totally biased opinion) it is completely psycho to think you're taking the moral high road by refusing to include consensual sex while writing a book that eroticizes killing people.
An insightful Mormon reader commented that it makes sense because people might actually be aroused (hence tempted) by depictions of sexuality, whereas there's essentially zero chance of being tempted to take up sucking people's blood. (I'm paraphrasing -- the actual comment was on the original Utah Valley Monitor edition of the article, now lost to the ages...). I contend that it's still psycho, and if you'd like to see why, just have a look at my brand new post for The Visitor's Center called The Carnal Bite.
On the other hand, the Mormons aren't the only ones to use this sort of reasoning. Take the very popular Belgian/French comic book hero for kids: Lucky Luke. He's a wild west gunslinger always shooting it out with the bad guys. I'm not sure how often he actually kills anyone in the pages of his books, but as I recall, a recent album featured a noose on the cover (some sort of adventures in Wild West justice, I suppose...). A few decades ago, the writers were concerned about Lucky Luke's influence on the kiddies, so they decided they needed to make some changes. Can you guess what change they made?
They had him quit smoking.