While i, myself, am married to a wonderful Canadian, i know quite a number of wonderful American girls of a wide variety of dispositions, and even geekiness, whose relationships are not fundamentally based on selfishness.
To be honest, having read through your comments on this thread, i have to question this whole endeavor. If your main concern is having a relationship just to be in a relationship and get your other "needs" out of the way of your productivity, i really pity anyone you date.
My relationship w/ my wife is, at this point, no small part of my identity. It is a source for support & discussion about what i'm doing, even though my wife is in a totally different field from me (i'm a programmer with a degree in linguistics, she's a food and nutrition science student w/ a culinary degree). Likewise, i'm a source for support for her, and the puzzles or trials she's going through.
Neither of us are in this relationship solely for the purpose of self-gratification. We're committed to our relationship because we genuinely like each other on a number of levels, and would like to help the other succeed.
I very much believe that relationships are built on trust & mutual respect. And if you want to attract someone who is your equal, who is interested in your well-being and is interested in being around you and supporting you & your life, you've really gotta be willing to do the same.