Answer:
Slang for the male half in a marriage.
A king wears one on his head.
What is red and smells like blue paint?
It goes up and down the stairs without moving.
Not my sister nor my brother but still the child of my mother and father. Who am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.