Why men ogle

My mom always used to point out (with a little sense of superiority) that mem judge women by their looks, whereas women judge men more by their personality.

I think it may be due to evolution, that maybe sometime in the past, women were more interested in sex at certain times of the month, and during those times, they would put on displays, make themselves look better, etc., and men would know by that that they were ready to have sex. Therefore, men developed the tendency to pay attention to how a woman looked and determine from that whether or not they would be open to having sex.