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8 (Unbelievably) True Facts About Redheads

Redheads are special, but do you know just how special?

Well, only about 2 percent of humans have red hair—not counting those of us who force the issue through science. That makes it the rarest of human hair colors (expect maybe in Ireland and Scotland).

Here are some other did-you-know facts about gingers:

Ancient Greeks believed redheads turned into vampires after they died

Seems reasonable.

Redheaded women bruise more easily

In recent surveys, redheaded women reported bruising more easily than women with other hair colors.

Redheads produce more vitamin D

Because most redheads have their roots in cloudy countries like Scotland and Ireland, their genes have adapted to produce more vitamin D, meaning they don't require as much sun for healthy skin.

Redheads are more sensitive to temperature changes

According to recent studies, redheads feel temperature changes more dramatically than people with other hair colors. So next time your ginger friend complains that she's too cold, hot or whatever, remember it's not her fault.

Redheads are more sensitive to pain killers but need more anesthesia during surgery

An ever-growing body of research is investigating why redheads seem to be more sensitive to pain: "Researchers believe redheads are more sensitive to pain because of a mutation in a gene that affects hair color," reported the New York Times in 2009.

And Time wrote recently that "Those with the MC1R mutation are more sensitive to opiate pain killers—which means they’d actually need less—but less sensitive to other types, most notably lidocaine injections."

Redheads have more sex

A study by Dr Werner Habermehl a German sex researcher, found that on average redheaded women have sex more often then blonds, brunettes or women with any other hair color.

Psychologist Christine Baumanns told the Daily Mail the results may be because "Red stands for passion and when a man sees a redhead he will think he is dealing with a woman who won't mess around and gets straight to the point when it comes to sex."