If we take a look at hollywood movies from the last 20-30 years 99% of the time its featuring a man with dark brown/black hair paired with a blonde (usually peroxide blonde) woman as the main roles.
We can move on on tv Series , Friends? any blonde woman or man to be seen? Jeniffer aniston is as naturally blonde as barack obama, what about lisa Krudow? take a look at her prom pictures, thick black hair is what she got from nature.. Going through more recent series we have big bang theory where jewish and indian characters are portrayed but there isnt any natural blonde to be fodun, kaley couco is definitely result of a few session at the hair dresser.