I love men with dark hair, the hairstyles I prefer are spiky, mohawk, or shaved...But never long...
On a woman I prefer dark (brown/black) or red. And any hairstyle is fine as long as the hair isnt damaged.
Oh and Teddy's hairstyle is hot too, he could never go wrong. 
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"Nature already created the perfect dishwasher....its called a woman." - Fiend