Sony Ericsson Xperia X10 :: Use Of Bluetooth / Access To Phone Files

I tried to send my wife a copy of a picture using Bluetooth yesterday, by going to the picture, pressing the left button (the one with 4 squares).Somehow, it gave my wife access to all the files on my phone.That didn't matter, insofar as there was nothing on it I didn't mind her seeing (though I don't think she expected quite so many pictures of Lucy Liu! ) but I wonder if anyone knows what I might have done wrong?Or, perhaps, the phone is set up in such a way that you have to be sure to trust someone completely before sending information by Bluetooth?If it helps, I'll try to recreate what happened later, but if anyone knows off-hand what I might have done and how it ought to be done differently.