Interesting topic. Especially since it's one that's always running through my brain due to my parental situation. My dad's partner is Caucasian and my dad is african american. This is the same man that was the division of my parents divorce. So, naturally my mother has differences about it and I hear it non stop all the time. "Ugh, if I see another black man with a white woman. Like, theres not enough black women for him to date." It gets pretty annoying because race should have nothing to do with who your dating. It just makes things more difficult if you ask me.
And, it's funny because I have a higher attraction to Caucasians then I do my own race but like I tell people I don't discriminate. I just like what I like but in my family, I'm the only one that's openly gay. And willing to date outside my race, it honestly could be because of my father but I don't think so.
To answer your question, for me I find it to be kind of like taboo or forbidden fruit. It's something different and not seen as traditional. But gays as a whole I think its because were open minded we've already gone against the social norm of being gay so why not take it further and date someone outside our race. I find it sexy! And don't get it twisted there may not be a lot of interracial couples marrying but there are alot of them out there. And it's steadily growing!