It has long been reckoned that blondes have more fun - but now they are thought to be more confident and amorous too.
Scientists claim their research shows that bleaching hair does wonders for a woman's self-image.
They feel more attractive, more likely to ask someone out on a date and become more adventurous in the bedroom.
This increased confidence does not just affect a woman's love life. They find it easier to summon the courage to approach their boss and ask for a pay rise after colouring their hair blonde.
Bottle blondes are also more likely to complain at unfair treatment and more inclined to put their foot down with friends and relatives, according to the study into the effects of hair dyeing on mood.The research could help explain the success and allure of stars from Marilyn Monroe and Lana Turner to Jessica Simpson and Kim Cattrall.
While lighter locks lifted mood the most, other changes of hair colour also gave women a boost. Mark Sergeant, who carried out the research at Nottingham Trent University, asked more than 200 women how they felt before and after dyeing their hair.
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Brunettes are also more likely to marry a millionaire, with research showing that around two thirds of the world's richest men have a brown-haired partner.
The good news for redheads is that they apparently have the best sex lives.
A study of hundreds of German women found those with red hair had more partners and had sex more often.