I have never considered a non white person sexually attractive. I've seen blacks/asians/indians/etc. and thought "wow, they have nice features," or,"wow, they have a nice body," but I've never personally felt anything upon looking at them. I'm not saying I've decided against this, if one day I stumble upon an adorable asian girl I'm perfectly willing to alter my statement. But as it stands, I've only ever been turned on by white girls.
I can hear all of you rising up now, full of righteous fury, screaming racist. But let me stress I personally have nothing against any race of people. Quite to the contrary, I have many friends from all different ethnic backgrounds, and I've dated quite a few of them. I've enjoyed the company and become great friends with many of these people, and I've dated asians/blacks/indians, some for a significant period of time.
My point is not that I dislike these people, but that I don't find them attractive. This affects the people I date, and I'm willing to confess most of my girlfriends were white. I've dated people of other cultures and enjoyed being with them immensely, but I was never sexually satisfied, which has been my only problem.
tl;dr - I've got a lot of great friends who are asian/black, but I find white people hotter. Crucify me.