Do your share your Passwords/Accounts/Gadgets with your "Significant Other" ?

I had an argument recently with my wife about Facebook passwords. I found and friended an old friend from grade-school ( A girl ) And the wife kinda freaked out and started typical jealous woman behavior which lead me to change my Facebook password. I am not hiding anything but I don't like the idea of being spied on. I am just curious as to how many people share their passwords/gadgets/and accounts with their wives, girlfriends, boyfriends etc.