What Am I Riddles

Question: My first two are male, and my first three female.
My first four save them both, and my whole is a female of the same sort.

What am I?

Question: If you're looking for something sweet I know what to do.
But if you don't like heat I'm not for you.

What am I?

Question: Not chest or box is now discussed. Money can be held in it, but just as we test its metal, within it there is rust.

[What is it?]

Question: Enter one hole and leave three,
once you succeed I'm on thee?

What am I?

Question: Had by few but treasured by all,
I'm on the inside and outside and I make men fall.

What am I?