Answer:
By Moon or by Sun, I shall be found. Yet, if there's no light around, I am undone. What am I?
I am rarely touched but often held. If you are smart you'll use me well. What am I?
Everyone asks for me but yet everyone hates to face me. For someone I am agony for others I am relief. Who am I?
Though I am dark Adam married me.
I fly when I'm on and float coming off.
Said to have fifty shades