Beauty is not merely in the eye of the beholder but that there are universal standards of attractiveness on which most of us can agree.
Standards of attractiveness are similar across different genders and cultures. Cross-cultural research has found a variety of commonalities in people's perception of beauty

A feature of beautiful women that has been explored by researchers is a waist–hip ratio of approximately 0.70. Physiologists have shown that women with hourglass figures are more fertile than other women due to higher levels of certain female hormones, a fact that may subconsciously condition males choosing mates. Researchers have replicated the result under more controlled conditions and found that the computer generated, mathematical average of a series of faces is rated more favorably than individual faces.
Evolutionarily, it makes logical sense that sexual creatures should be attracted to mates who possess predominantly common or average features

Sexual attraction plays a part in being drawn to an individual
There are evolutionary control mechanisms for all sexual responses
Humans agree upon universal standards of beauty consisting of certain physical attributes, even across different ethnicity and culture subtle variations in how we look can convey vital information about a prospective partner’s health and fertility
In prehistoric survival terms, the basic rules were: the more symmetrical and voluptuous a woman is, the more likely her offspring are to be healthy, thus the standard of beauty. The more powerfully built a man is, the more capable he is of a) hunting to provide food for his family and b) protecting his family, thus the standard of beauty.
Size and shape
Women reportedly show a stronger attraction toward males who have a shape consistent with the ideal hunting physique: strong shoulders, narrow waists, and broad chests and shoulders. Men with a higher than average shoulder-to-hip ratio were found to have had sex at an earlier age and with more sexual partners. Women are also generally less attracted to men with a “belly,” and not just for aesthetic reasons. Men with a large amount of abdominal fat have lower levels of testosterone, which means lower sex drive and lower fertility.
Researchers note that young men are instinctively attracted to what is known as ‘the hourglass figure’, which does make biological sense since there is a direct correlation between a woman’s figure and her reproductive ability. Women with wide hips and narrow waists generally find it easier to give birth naturally and at less risk to the their young.
Online dating research reveals that between weight and height women are most concerned about a potential partner’s height, while men are more concerned about weight. Men even just an inch under the average height and women more than 20 pounds overweight have a tougher time getting a date. In evolutionary terms, height is an indicator of power and weight is an indicator of health and fertility.

http://thesocietypages.org/socimages/2013/03/18/1950s-beauty-pageant-judging-guidelines/ http://hellogiggles.com/a-new-standard-of-beauty-the-uncanny-similarities-of-the-20-korean-beauty-pageant-contestants http://theyorker.co.uk/features/13772-why-beauty-is-not-in