I wouldn't sweat it, last time I was in Japan there were plenty of Japs, even in Hiroshima and Nagasaki, Tokyo insanely so.  We fire bombed (one of the worlds largest fire storms) 26 miles of Tokyo and killed more than we did with the A-Bomb and still the place is crowded.  If your looking for a wife that comes up to your belt line in height, this would be a good place to start.  The place is expensive and the people are always nervouse and in a hurry, absolutely frantic.  Don't even think about riding a subway.

On the good side they like a lot of the same stuff as people in the US, so you can at least have an intelligent conversation with them.  Old Japs are pretty active any away.  The old guys at the Akido world headquarters will kick your big pink bu## white man.