My interpretation's somewhat close to devilgirl's, but I think the song's from the perspective of one couple, probably a married couple (marriage is the imagery I get from "tie a woman to your wrist"). I also agree with despero that it ties into Boxer's running theme of losing youth. They've been together a long time, the spark is gone. When they got together they were young and rebellious; becoming society's definition of "adults" has dulled them down ("we're starting to stay the same"). That they're in the guest room means that they're no longer in their bedroom: they've become strangers, the intimacy is gone, they're visitors in their own home. It used to be about passion and fun, now it's about money and stability.
My interpretation's somewhat close to devilgirl's, but I think the song's from the perspective of one couple, probably a married couple (marriage is the imagery I get from "tie a woman to your wrist"). I also agree with despero that it ties into Boxer's running theme of losing youth. They've been together a long time, the spark is gone. When they got together they were young and rebellious; becoming society's definition of "adults" has dulled them down ("we're starting to stay the same"). That they're in the guest room means that they're no longer in their bedroom: they've become strangers, the intimacy is gone, they're visitors in their own home. It used to be about passion and fun, now it's about money and stability.