I'm not really sure sexual orientation has anything to do with it. In fact, I'm pretty sure one gay friend I'm thinking of has a black iphone and the married friend I'm thinking of (the one who recently told me not to tell another one of our friends who lives back in NOLA that we were getting together for drinks in DC because the NOLA friend would get upset that he wasn't here) almost certainly has a white one. Though I can't confirm that at the moment.