The male cardinal is quite beautiful, bright red all over. Flashy, you could say.
This female in our yard, with the light on her, showed an apple-like glow. The female cardinal's red is a dull red, pale, not flashy; still, she can show beauty.
The other half is an expression we use to refer to the less-noticed one in a partnership, sometimes the wife, sometimes the husband. My other half or, sometimes, My better half we would say with good humor. I wonder if all languages have a similar reference.