Answer:
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
I am nothing really at all, Yet I am easily found; Ignore me at your own peril, and you might end up crowned!
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.
What goes in, but never through? I've got some and so do you. We might lend one, or even two, but only if our trust is true.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?