Caucasian blondes are usually slightly higher in oestrogen than brunettes and are likely to exhibit other infantile sexually selected traits (indicating low levels of testosterone) that are considered desirable by males, for example finer facial features, smaller nose, smaller jaw, pointed chin, narrow shoulders, smooth skin and less body hair, and infantile behaviour such as higher energy levels and playfulness. [. . .] Blond hair in males does not correlate with oestrogen levels as it does in females
Why do men find blonde women so very attractive?
"Carole Jahme shines the cold light of evolutionary psychology on everyday life. This week: The allure of blonde women":