.htaccess is your friend, you are already rewriting the non-www version to www, do it accordingly with the index.php/.html files.
http://www.adultsitesurfer.com/index.php
http://www.adultsitesurfer.com
See the PR difference? You are creating duplicate content on your site this way and unfortunately google is that stupid and may rank your worse for it in contrast to what beta-tester says...but what's definitely right: linking to index files instead of / is bad practice.