Since when is symmetry relevant? I thought it has been sufficiently shown that symmetry plays no role for beauty. Pretty sure fitness has a bigger impact on beauty than features you cannot change without surgery.
Not only symmetry, but also the proportions. People are evolutionary wired to use symmetry and proportions of faces and bodies to estimate health and survival/reproduction "value". This is not the only factor, of course, but a huge one.
I remember in biology we learned that symmetry is an indicator of good genetics, so it makes sense that we are biased to symmetry since higher fitness/survivability.
