I've got light brown hair, and my wife has naturally slightly darker brown.  I wonder if people tend to pair with people with the same hair color.
I'm not so sure about that. I have brown hair, but hubby has black hair. 
I guess it's a silly thought, but sometimes I have them :P  Fun fact, your husband has more hair follicles because of their black hair?
Really? I didn't know that. I guess that explains why his hair is much thicker then mine. 
Yeah, it would be that.  It's probably one of his defining characteristics :P
Yes, I have always loved his hair. Even if it is turning grey now. lol
Grey hair can look really nice.  I wonder if the fact that brown is the second most common hair color makes it more likely to see it go grey.