Hair color, hair length, straight or wavy, etc.
On a girl I like really wavy hair. I love natural read heads but any hair color in general works if it fits the face. Short hair can REALLY add serious cute points but at the same time long (maybe to the shoulder blades) can add sexiness to a woman.
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On guys I love medium length to long brown or dark hair. I can't handle short hair on guys, and I prefer it styled alternatively. Guys who can rock hair just above the shoulder look amazing :3