A man is a wolf

A man is a wolf, if you choose the right one ,he can  protect your whole  life; if choosing  the wrong one , you will be killed .  A woman is a snake , if  you pick the right one , she loves you and wraps around your whole life , if wrong, poison  you to death.  Friend is road , if choosing the right, you can reach the destinations directly; if wrong , misled your whole life  forever.