Physical attractiveness correlates with health.
Especially facial symmetry correlates with a lot of factors.
Mind Hacks: Male body symmmetry, more female orgasms SpringerLink - Journal Article
In addition factor like large breasts increase likelihood for reproduction because breats are seen as female and even when it doesn't produce real benefits being seen as more female if you are a woman or as more male when you are a man increases your chances for reproduction.