By "the same old thing," I meant the woman herself, not what I'm doing. Believe me, we've done every position, every room in the house, role playing, you name it.<quoted text>
Sounds like you need some spice in your relationship, since you're saying you're tired of the "same old thing". Be mysterious and try new things with the person your with.
After a while, you've just had a woman so many times that it becomes boring and you need a new one. Sad but true.
Do you know that jolt of excitement you get when you're out with a new girl for the first time? The rush of a first kiss? You can't get that back in monogamy. Ditch it everyone, for your own good.