I have been a blonde, a brunette, and a red-head, and my husband loves me just the same, so I doubt that it matters.
But then, Blondes may have more fun but redheads have more sex, according to new research in Germany
And a U.S. study has found that redheads are twice as likely to avoid going to the dentist because we feel pain more acutely than our blonde and brunette cousins
So there may actually be some sort of genetic difference not just in hair color, but in behavior. OTOH, it could be “learned behavior” based on cultural stereotypes, as Wikipedia says here:
“Like many popular-culture stereotypes, the origins of this concept are murky. The 1925 Anita Loos novel Gentlemen Prefer Blondes: The Illuminating Diary of a Professional Lady (later used as source for a film by the same name starring Marilyn Monroe) featured the character Lorelei Lee, a beautiful but empty-headed singer. While some look to this as the source for the concept, in fact, it might be far older.”
“Some have suggested that, because Caucasian babies are often born with at least a touch of blonde hair, an association has arisen tying those having fair hair with childhood and youth (and the accompanying proclivities toward naïvité and/or innocence). Also, as blonde hair is often associated with physical attractiveness and youth, some argue that those around blondes may have a tendency to admire or fawn over them, encouraging some to behave in a child-like manner (consciously or not) in order to gain attention and affection. Alternatively, this same association may instill a degree of jealousy in others who look to their covetees’ hair color as an excuse for derision.”
“On the other hand, some have postulated that the association is far older, having its roots in ancient times. The ancient Greeks and Romans were fascinated by the fair hair of the Celts and the Nordic peoples and wished to emulate their red and flaxen tresses. People in the Mediterranean area often bleached their hair or bought wigs made from the hair of enslaved Germanic and Celtic peoples, and most notably the highest-ranking courtesans. Due to this association of red and fair hair with harlots, light hair earned a degree of contempt from the high-ranking ladies of society.”
“In Medieval Europe, the upper classes tended to be darker haired than the peasantry, likely due to the period tendency to marry within one’s own class and the fact that lower class people were far more exposed to sunlight. Blonde hair was, at this time, often associated with commoners, who were ostensibly deemed less intelligent.”
Puritans, associating makeup and dyeing of hair with prostitution, forbade the dyeing or bleaching of hair, creating an imprint on dyeing hair that lasted until the 1920s. The “dumb” side could have been a way for wives of adulterous men to reassure themselves about the infidelity of their husbands; to think that their husband’s blonde mistress was sleazy, worthless, ditzy, and not very intelligent.”
“Or, the idea might stem from the idea amongst Romans and Greeks that Northern Europeans were barbarians and thus less advanced than Southern Europeans.”