Slightly off topic, but it the degree to which many, maybe most men, are primarily attracted by a single feature of female anatomy ("leg-man", "ass-man", "tits-man" etc) always seems surprising/unintuitive to me.
Perhaps I am unusual (actually there is little doubt about that many would say), but my visual reaction to a woman can focus on almost any part of her body...depending on her overall appearance and how she is dressed etc. Basically her best and/or worst (most and least attractive) features sort of "jump out at me" and determine how hot she looks to me. But almost any specific feature can strongly attract or repeal me.
Hair color is similar; many guys find one color much more attractive than the others, but for me hair color can be important or not depending on how it influences her overall looks.
-Ww