Scientists say they have discovered why some people are good looking while others turn out ugly.
A 10-year study has revealed that some people have less efficient 'repair kits' in their DNA.
Charles Darwin's theories of evolution say attractive females should select the more attractive males and good genes should spread through the population over time to the point where males all become equally good-looking.
The fact that all men aren't hunks like Brad Pitt or George Clooney is used by opponents of evolution as an argument that Darwin's theories are fundamentally flawed.
But now a team of researchers at Newcastle University has found a way of explaining the so called 'lek paradox.'
Research published by Professor Marion Petrie and Dr Gilbert Roberts explains why the human race isn't uniformly gorgeous.
Professor Petrie said: "It's much easier to think of it in terms of peacocks.
"You have a system in peacocks where males go around looking attractive and those that have the biggest and best tails get the most attractive females.
"Evolution would suggest that over time all peacocks would look the same because those good genes would spread through the population.
"But that doesn't happen and instead you get generation after generation with big tails and short tails, the choice doesn't disappear.
"What we've done is come up with a theoretical explanation for that."
Professor Petrie says that since mutations can occur anywhere in an animal's genetic make-up, some will affect the DNA repair kit possessed by all cells.
As a result, some individuals have less efficient repair kits, resulting in greater variation in their DNA as damage goes unrepaired.
Using a computer model to map the spread of genes in a population, Professor Petrie demonstrated DNA mutations outweigh the effects of sexual selection.
Professor Petrie and colleagues have shown that men with better genes for fighting off disease - and therefore better prospects of passing disease resistance to their offspring - had a number of physical features which women found attractive.
The research involved testing men for genetic diversity and showing photographs of them to women, who allocated scores for attractiveness.
These scores were found to correlate strongly to genetic diversity.
The new research is published in the scientific journal Heredity.
Read more: http://www.dailymail.co.uk/news/article-445184/Why-people-good-looking--plain-
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