Thanks for your helpful response Ryan. H\I have a much better understanding of your home situation. I can also see how you would have thought that I was picking on you based on my comments to other posts you've made. That was not done on purpose but more to do with my having more time on those occasions to read and reply to posts that caught my attention. You happened to have raised topics that I had found interesting. My choice of words in replying to your post betrayed a mis-reading of what you had said - for which I apologize.
I like TD's comments (above) on the topic of monitoring other's activities on computers. There does seem to be a different attitude (among people - not specifically you) toward tracking in detail others' activities on computers than there is to eaves-dropping on and/or recording telephone conversations. It can be justified as when parents rightly want to ensure their minor children are sticking to safe sites etc. I also take the point that it is your computer but again, people who own landline phones usually do not track calls and content of others who use their phones (unless there are toll charges - and only then for ascertaining length of calls, not content of calls.
James Woods also expressed a point of view I can identify with: I would not want to have my computer co-used by others and it's got nothing to do with use of so-called private and/or adult sites. it's just a personal boundary issue. I also accept we are all different, as are our circumstances.
My philosophy is to remain open to feedback and, if I have erred, to apologize and do better next time. Steve