Women get into a relationship hoping a man will change, and he never does; men get into a relationship hoping the woman don't change, but she always does. Men want their partners to be consistent. That they won't make impromptu impossible demands nor baffle him with classically female sudden-onset hysterical behavior.
When you look in the mirror, it's usually to fix your hair or put on makeup. To examine your body searching for problem areas. We look at ourselves to see the flaw, not beauty. And we look at predictable times, in the morning, after using the bathroom, before bed. We hardly ever see ourselves when we aren't prepared for inspection. But only when you're unprepared can you see your true self, your true beauty.