Answer:
Turns me on my backs and open up my stomach. You will be the wisest of men though at start a lummox.
When you buy me I am costly, but the only use I have is hanging only. What am I?
I hold two people together but touch only one. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.
I am a kind of coat that can only be put on when wet. What am I?
The virgin gave birth to a child and threw away the blanket.