Why are couples portrayed this way in television and cartoons?

Family Guy - Lois (skinny and attractive) Peter (idiotic and grossly overweight) King of Queens - Carrie (skinny and attractive) Doug (idiotic and overweight) The Simpsons - Marge (skinny and attractive) Homer (idiotic and overweight) The Cleveland Show - Donna (average build and attractive) Cleveland (slightly... show more Family Guy - Lois (skinny and attractive) Peter (idiotic and grossly overweight)
King of Queens - Carrie (skinny and attractive) Doug (idiotic and overweight)
The Simpsons - Marge (skinny and attractive) Homer (idiotic and overweight)
The Cleveland Show - Donna (average build and attractive) Cleveland (slightly overweight)

I just notice that, in some shows (obviously not all) are portrayed with an overweight and idiotic husband. Why?
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