I was in the middle of reading a manga and had to say this. Tozaki is the best uke EVER. Seriously. Sure, i have seen ukes with a backbone before, but it has been so long that Tozaki is really refreshing. Even thought he has a reserved personality, he knows exactly what what he want, why, and doesn't tolerate being treated unfairly. You don't see that often with those types. :)
I was originally introduced to Junjou through the live action movie starring Tochihara Rakuto(love, love, love! He plays Ageha in RH plus!) as Tozaki and Takahashi Yuta as Kurata. In the movie, you don't feel as much of Tozaki's "backbonishness"(?) as in the manga(because Tochihara Rakuto makes everything adorable), but it is still pretty good. The movie is on Youtube, but there are only Chinese subs. So, if you understand some Japanese, you should be okay (I was able to follow along pretty well). Manga link below becuase if you Google it, you'll have to sift through a bajillion Junjou Romantica(X3) sites. :) Check it out if you're interested.
manga link:
http://manga.animea.net/junjou.html