I run a legal
tube so I don't have any problem with legal tubes.
I use this page to check back links and PR since I don't feel like opening Firefox.
http://www.pagerankwiz.com/
I get a PR0 with zero back links on
http://www.watchmyhotgf.com/
And a PR1 with 10 back links on
http://www.nudecollegegirls.tv/
What is the URL of your PR5 site?