Blonde bombshells such as Marilyn Monroe and Pamela Anderson would have had no problems with our pre-historic ancestors, as scientists in a recent study reveal they preferred blondes, too.

The study claims blondes are no more than a trick of evolution to get hold of the elusive caveman, according to Sky News.

Men were in particularly short supply at the end of the Ice Age 11,000 years ago.

They had to go off on long, dangerous expeditions to search for food - and they often didn't come back.

Using female ingenuity to address the problem, women developed blonde hair and blue eyes to entice men.

Although, a shortage of blondes is in the future, as the blonde gene is becoming more and more rare, the World Health Organization estimates the last natural blonde will be born in Finland in 2202.