So the moral of the story here is if you want to be a perv, do so on AIM.
Being a "computer person" I know exactly how easy it is to monitor someone's traffic. I usually stick by the rule that if you have any doubts about it, don't. Another good rule: If you wouldn't say/do it in front of your mother/grandmother, it's a no-no.
Although, my grandma can get a little raunchy after a glass of wine, so that one is up for interpretation.