Could someone explain to me why Lois is more straight then Clark?
Leaping in here:
You've got the wrong defition in mind for "straight".
In comedy the guy who tells the joke is the comedian and the guy the joke is told to is the "straight man". For a joke to work, both are necessary, but the comedian gets the accolades.
An ancient example: Jack Benny was straight man to Gracie Fields.
"Tradition. Abbott and Costello. Martin and Lewis. Straight man always goes first."
Costello and Lewis were the comedians; Abott and Martin were their straight foils.
Hope this helps.
Artemis
