Please ignore the correlation between "looks" and genetic indicators of reproductive health
That would be a nice argument if there was some universal agreement on what is attractive. In some cultures, thin is attractive. In others, fat. Some places like women who stretch their necks out. Others like their feet bound to the point that they can hardly walk. In Meiji era Japan, it was seen as attractive for women to paint their teeth black. Do you find that hot? There is no single standard of beauty. You cannot just declare yours to be universally applicable.
The majority of "beauty" traits have nothing to do with genetic indicators of reproductive health. That said, there are some. For example, for both sexes, "clear skin" is usually desirable, as that is an indicator of immune system fitness. And of course standard secondary sex characteristics, including having typical voice ranges appropriate to their sex, muscle mass in men, in women breasts and wide hips, etc. But the majority of the specific details that make up the "look" of an attractive man or woman versus other men and women in their society are simply cultural.