- Because redheads have thicker hair than people with other hair colors, they have fewer strands of hair. For example, while blondes have on average 140,000 hairs, redheads have approximately 90,000.
- According to Hamburg sex researcher Dr. Werner Habermehl, women with red hair have more sex than women with other hair colors. He also postulates that women in a relationship who dye their hair red may be signaling that they are unhappy and looking for something better.
- In ancient Rome, redheaded slaves were often more expensive than those with other hair color.