[support] Google pages

We have a Drupal 7 site which has a significant amount of information in members area database which is access controlled by permissions and roles. I have noticed that in google many of our member's only pages are appearing. There are over 20 so far.

As the information for these pages is derived virtually by Drupal via taxonomy and views, I am wondering whether the member's pages google finds are the result of members searching and google memorising the search or whether in fact google is searching the site and creating the pages.

Can someone please advise me how best to stop google from finding and accessing members only data. Help or even some understanding of how to manage this would be of great assistance Thanks in advance Roger