Through my extensive scholarly research of hot women I have come to a very definite, scientific, conclusion of hair types for you. This of course has nothing to do with the actual quality of the human being, which is far more important as I'm sure you recognize. This observation is merely objective.
I have noticed that female hottness, in regards to hair color, can be quantified and qualified.
#1. The largest majority of attractive females are blond. This could be the reason for the stereotype that blonds get for being the "preferred" hot girl. Generally speaking of course.
#2. The quantity of attractive brunettes are less, however the quality of there hottness, in general, seems to be of greater caliber; possibly due to their higher scarcity.
#3. Even more rare than this is the attractive red head. We almost never see red heads that are attractive. When we do, however, they are most certainly reserved as having the highest quality of hottness. This based off the same economic theory of scarcity. "The rarer the bird, the finer the prize"
As proven by your poll, blondes get more attention for a verity of reasons. Maybe because they stand out more (light color), or maybe for the stereotype that they are more fun and outgoing. When we think about blondes we are almost conditioned to become more excited. I think that the attention blondes get stems from men almost always expecting the word "blonde" to be associated with someone that is hot.
Seriously there is no understanding of it and I'm not a guy but I'll answer this question cause I heard this saying! Blonds are beautiful - so sometimes it's good to fool around with them cause they aren't so intelligent! Brunettes make good wives but are very unattractive but smart! And redheads are just sexy cause they are most likely to come by as unique! Now which one a man chooses as his wife well that will above all if he finds her interesting! Now this I heard somewhere so yea not dissing any girls out there! So don't take this personally cause whatever hair color you are if you got nothing up there any guy will just take advantage of that!