In my opinion humans, by nature, aren't monogomous creatures. If were we would all instinctively find and stay with one partner, and one partner alone. If we were really monogomous we wouldn't date at least five different people in our lives, we wouldn't have one night stands, and we wouldn't divorce either. But we do, we do all those things with the rare exception here and there. I think monogomy is something imprinted on us through culture, not nature. And yes I know it takes several years for a human to reach maturity, but that's not a valid argument as to why humans are monogomous by nature--there's plenty of other animals where the offspring get cast out before they actually reach full maturity.
In the end what matters is what others think, but what you and your girlfriend think. If you two are happy living your lives together this way, then more power to you. Keep in mind, though, that for every advantage there is eventually going to be a disadvantage. Could be that one day you don't feel like doing this kind of thing anymore, but she still does, or vice versa. Then what do you do?
My advice to you is to try and make absolutely sure you've talked about everything there is to talk about. Don't just dive into something because you think "sweet now I can do her room mate!" Think first, talk second, act later.
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