Answer:
I am just two and two. I am hot. I am cold. I am the parent of numbers that cannot be told. I am a gift beyond measure, a matter of course. What am I?
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
I drive men mad for love of me, easily beaten, never free. What am I?
I am shared by goats devils and unicorns.
Teenage girls are pros at creating me. Learn me in classes.
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.