Why? All vampire enjoy blood, the taste, the feeling, the color. It's not a matter of biology, it's a matter of sexuality. A willing participant giving blood to a vampire is naturally has an attraction towards them. A person that enjoys being bled automatically has a preference towards the color red. A vampire with red hair has an edge over other vampire when it comes to consensual blood letting.
It also works both ways. A human with red hair in a relationship with a vampire will be bitten more often than one who is not. Something to think about when considering your next partner.
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