An employer may never tell you that you were denied a job or a promotion because you're unattractive. On the other side, your employer may never mention that you were only hired because he or she does find you physically attractive. However, there is evidence to suggest that this is exactly what goes on in the workplace.
For example, those who are considered more physically attractive have been found, in certain studies, to make more money. This suggests -- though there are many factors in play here -- that it may be easier for them to get promotions or land high-paying jobs.