Why do women change hair colors and styles more than men?

I was talking with a group of friends and we noticed that women change their hairstyles much much for frequently than men usually. We also tend to color our hair much more often. Why is this? Is this societal expectations or is there something else going on? I know some men who have worn the same hair style for years. I know that some have baldness, but I am talking about the ones with hair. I have known a few guys that changed hair styles or even colored their hair but not nearly as often as women. Do guys just go with a style that they like, and go well it worked yesterday so it will work today. I am just interested in why these behaviors are like they are as general rule.

Why do women change hair colors and styles more than men?
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