Best not to involve the staff of the schools you are applying to in your attempt to get accepted on basis of your relationship... Like another user said, this may even be counter-productive.
I am in a very similar situation--except I'm going for a Masters in English and my boyfriend is going for a PhD in Sociology. Because of the immense specificity of his degree (Worlds Systems Analysis) we only applied to three schools together. He's already been admitted to his top two choices, but Masters acceptances don't seem to be coming out of those schools yet and I have my doubts. In the end, if I don't get accepted, I'm just going to have to gather my wits and try again next year.
Being in a relationship always complicates things, and you may have to make a compromise here.
But until it comes to that, try to stay positive and hope that a school will match up for you. Even if it is not your first choice, it may be best for you in the long run as a couple.