Answer:
The person who makes it has no need for it. The person who purchases it does not use it. The person who does use it does not know he or she is. What is it?
A seed am I, three letters make my name. Take away two and I still sound the same.
Who has married many women but never has been married who is he
Turn us on our backs and open up our stomachs you will be the wisest of men though at start a lummox.
Has feathers but can't fly. Rests on legs but can't walk.
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.