Do blondes have more fun?
We can’t be sure about fun, but female blondes do make more money:
This study contributes to the economics literature that links physical characteristics to labour market outcomes, by investigating the influence of hair colour on women’s own wages and also their spouse’s wages. Using U.S. panel data, we find that blonde women receive large wage premiums.
Source: “Physical appearance and wages: Do blondes have more fun” from Economics Letters