FFS at least google a bit.
There was some persuasive study which suggested blonde hair developed among females to attract men during a time of high female to male population ratio after the last European ice age. It may well have first appeared in Scandinavia, and moved to trading. Gradually it changed to red hair - possible as it was more successful at attracting males.
My theory is the present discrimination is because there aren't enough redheads to go round - men do find them attractive, but cannot admit to wanting something they are not likely to get.
( Larry Vest One day at a time, sweet Jesus, FFS., Fri 26 Feb 2010, 9:49, 1 reply)

Blonde hair as sexual attractor
The other theory is that as blonde hair is more common in the European young, blondes who retain their hair colour into adulthood appear more youthful/healthier, and a better mating prospect. Also, as a youthful appearance is more effective at reducing aggression, they were less likely to be killed.
(all my scars face forward possesses 2.5% of a hyperalloy combat chassis, Fri 26 Feb 2010, 10:09, closed)

Dark hair = waaaaaaaaaay more attractive

( idonthaveafunnynickname Drink-Aware? Sure. I'm aware I want another drink., Fri 26 Feb 2010, 10:37, closed)

Try telling Hitler that

( sandettie light vessel automatic New Twitter - @bollocksreally, Fri 26 Feb 2010, 11:49, closed)