The say men prefer blondes, but anthropologists believe that the fixation with blonde hair has existed for a really long time. Historically, blonde became fashionable in northern and eastern Europe 10,000 to 15,000 years ago.
But new findings show that it might have been a thing during the cavemen days.

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Peter Frost, an anthropologist at Laval University in Quebec City, explained to Discovery News the evolution of blondes locks in the human population helped women compete for mates among a limited pool of suitably virile cavemen.

The theory has to do with the Ice Age, when men traveled longer distances to hunt and forage for food. That meant a higher risk of dying, leaving the women folk with a much smaller pool to choose from. And in order to attract the most male attention, blonde hair was evolution's eye-catching solution. And the appeal was rooted in the simple fact that it's rarer than dark hair:
The more common a hair color becomes, the less often it is preferred. It's a kind of novelty effect. The moment you become ordinary, you no longer have the same appeal. There's selection for being a bit different and eye-catching.
And there's no doubt that blonde hair is still somewhat of a thing today. Blonde hair dye is really popular with women in Latin America, because natural blonde hair in that part of the world is a rarity. But in Nordic countries, where there are more natural blondes, women prefer to darken their hair in order to stand out. So blonde hair is eye-catching in places where blonde hair is rare and dark hair is eye-catching in places where dark hair is rare. So be sure to thank evolution for your natural blonde locks.