Gingers...

Researchers have found that redheads require greater amounts of anesthesia, but other research shows that women with naturally red hair require less of the painkiller pentazocine than do either women of other hair colors or men of any hair color. A study showed redheaded women had a greater analgesic response to that particular pain medication than men. A follow-up study by the same group showed that redheaded men and women (and mutant "redhead" mice) had a greater analgesic response to morphine-6-glucuronide. Studies have also confirmed that red heads do indeed have more sex than women of any other hair color. [from Wikipedia "Red Hair"]

("Untitled" from Women series by Sarah Bay Williams)