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I've only had one "girlfriend", and I hesitate to call her that because it was long distance and lasted only 3 months--and she is a brunette.
I've had only one major crush in my life, and she is also a brunette.
On a daily basis, I would say that 60% of the girls I encounter who I find attractive are brunettes, 39% are blondes, and 1% are redheads--although this may just be the result of the distribution of hair color within the population.
So far blonde... I think.