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If you think about it, the boys' powers are one giant conservative-Christian masturbation analogy. From the age they develop their powers (between 12 and 13 years old) to the addictive nature of said powers, to the fact that they're being literally drained of youth and vitality with each use, which is honest-to-God what Christians used to think happened to young men who jerked it too much. Not to mention the fact that it's 'evil', and in their case, literally tied to what could be seen as devil worship!