Ain't alone bro, i'm the same way. People often think that if you don't brush your breath smells horrid and your teeth are all yellow. This is just completely untrue for everyone. I don't brush, yet my breath reflects the food I eat or the gum I chew or whatever, it's not "bad" (truth be told, no one has ever told me my breath has smell bad). My teeth aren't as yellow as some people who brush, but they are tinted none the less.
All this being said, the next question is why. I don't have time in my day to be worried about this now, and by the time I do need to worry (when they're falling out) technology will have improved to the point where it shouldn't be too much of an issue. My father is the same way, he's almost 50 and still has 95% of his teeth (one was chipped at work, so half is fake).
Brushing helps in many ways, i'm sure. However it's not something I have time in my life to currently partake in. Yes, my girlfriend of a year knows about it and she isn't bothered in the least.