Answer:
I am two-faced but bear only one. I have no legs but travel widely. Men spill much blood over me. Kings leave their imprint on me. I have greatest power when given away yet lust for me keeps me locked away.
What has many keys but can't open a single lock?
the only amusing part of the body
I am a delicious way of representing data.
What has a neck but no head?
What is full of holes but still holds water