Answer:
Often held but never touched. Always wet but never rusts. Often bits but seldom bit. To use it well you must have wit.
Pregnant every time you see her, yet she never will give birth.
What binds two people yet touches only one?
I cost no money to use, or conscious effort to take part of. And as far as you can see, there is nothing to me. But without me, you are dead.
What can be heard and caught but never seen?
What do you purposefully put lots of in and on your body, but run away from when you encounter it outside?