Sex? Women think about hair just as much: "In fact, women think about their hair almost as much as they think about sex. That's 43 vs. 48 minutes a day, a new poll says." <via mefi>

Perhaps one leads to the other...

University Study Concludes
Hairstyles Make or Break Your First Impression: "Within three seconds of meeting you, people form a first impression about the type of person you are, and it's not your face that gives you away -- it's your hairstyle! A recent study validates that your hairstyle dictates the first impression you make, significantly overpowering the impact of facial features."

But maybe it's a different kind Great Hair Day that matters.