I don't personally know why I enjoy the yuri genre. I guess I just like women (well as far as 2-D goes anyway). Real life display? Well I don't particularly find that all that arousing.
A good friend of mine once told me that "you like yuri? Guess what, it's never as sexy in real life" and I agree with him.
I think it might be because all the yuri materials I have encountered so far have excellent plot as well as artwork. They sometimes have developments and philosophies deeper than other works (not always the case though). But maybe I am just lucky to come across these ones.
It's a beautiful thing!