No politically correct answers, why is being physically attractive relatively uncommon?

I know average looking is the norm, but why aren't more people considered attractive? Why is it like 20 percent of the population is attractive, why not more?

Most people don't have the genes/structure for it
Most people don't groom well enough
So many people are out of shape
More people are attractive than what society and social media would lead you to believe
Select gender and age to cast your vote:
No politically correct answers, why is being physically attractive relatively uncommon?
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