I dunno about this...
I think it is still very widely believed that pheromones are chemicals that only animals (men is an animal, too, I know, but...) \'use\' in order to communicate. My guess is that by saying that the vampires from Blade 2 use pheromones to communicate, the producres/writers want to show us that they\'re not \'developped\' as far as us humans. They kinda look human, they act like humans in a lot of ways, but by saying that they communicate by using pheromones, you put them closer to savage, threatening animals or other organisms in the course of evolution.
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