I open and read all the e-mail for the pair of us. My excuse is -- my wife is severely dyslexic and she has trouble reading them and if she replies to anyone other than her sister and a few close friends they cant understand the reply so I have to do it anyway. However she can surf the web to her hearts content and I don't check up on that.
I have MSN Messenger set to "keep a record of conversations" on all my PC's,not for snooping but to confirm what I actually said rather than what my contacts thought I'd said.I then simply email the whole conversation history to them as I was sick of next visit to the contact to resolve a problem on their PC being told "You said to do that!"
I certainly have never felt a need to go hunt thru previous websites my GF or daughter might have visited.