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The first thing to understand about "fuck" as an intensifier is that it's fraught with taboos, and there are very complicated social rules about when it's okay to use it and in the presence of whom. For example, many IT staffers swear pretty freely on the job, but they're much less likely to use a vulgar intensifier in front of their boss, who might get angry about it and fire them for it. This is one of the reasons why IT workers tend to be more "rough" than, say, blue collar police officers, who are presumed to be unconcerned with social norms.