Red headed pain

From CNN.com
Redheaded Women Have a Unique Ability

Blondes may have more fun, but redheaded women have a special quality that is as unique as their hair color. They have an innate ability to tolerate more pain than other people.

In studies on "redhead" mice, which actually have blonde fur but carry a similar gene to the one that causes red hair in humans, scientists from the Human Genetics Unit in Edinburgh, Scotland were able to target the pain-reducing mechanism. These red-haired mice have a similar ability as human female redheads to withstand higher pain thresholds compared with other mice and require less anesthetic to block out certain kinds of pain.

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