I think Oggsdog is right, that the initial wanting-to-rip-the-clothes-off-each-other phase never lasts long term. That said, with a truly loving relationship, the intimacy (emotional and sexual) that replaces that first flush of lust, can lead to even better things.
The nice thing about having a long-term partner is that you (hopefully) know what turns each other on and are able to talk about embarrassing conversations like what you like in bed. If this sounds like you, WWUD, then there's defintely hope.
What about acting out your fantasies? Some people enjoy watching porn together. What about dressing up or sex toys? It may feel odd or silly at first, but being good friends as well as lovers means that you'll just collapse in giggles instead of getting embarassed and offended. And it's surprising how 'lustful' good laughter can make you feel...
One thing that worked for me was to do some sports together or go clubbing if that's more your thing. Getting all hot and sweaty next to each other, but not being able to do anything more than that as you're in a public place, can be quite erotic.
Hope some fireworks get generated soon. Keep us posted (not tmi mind you .