OS X :: Setting Up Shared File For Dual Accounts

My wife and I share an IMAC but have separate accounts. My problem is we store all of our photos in aperture 2. When my wife downloads photos, I don't know how to access them. When I download photo's, she cant access mine. I think we both have our settings for sharing files as we are both set up as administrators as well. Is there an easy way to set up both of our accounts to go to a shared file as a default so we can just lick our aperture and see photos from both accounts. We are both very computer illiterate so simplicity would be great as far as setting up to default to the shared file on uploads.