Answer:
Fatherless and motherless. Born without sin, roared when it came into the world. And never spoke again.
Metal or bone I may be, many teeth I have and always bared. Yet my bite harms no one. And ladies delight in my touch.
What is it something that you always have but you always leave behind?
The man who invented it doesn't want it. The man who bought it doesn't need it. The man who needs it doesn't know it. What is it?
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.