Sad to say for my japanese male friends.. but I know far too many japanese women that simply refuse to consider a japanese guy because of the prevailingly sexist attitudes men tend to have. The younger guys seem to be adapting a bit better but the older men... well the ones who realize they're about to get divorced will on rare occasion attend schools to Teach Them How Not to Be An Ass.
Japan has a lot of attitudes that I would characterize as "early 60s" ... they're right on the edge of enough women saying "that's enough of this shit". Of course, American attitudes keep seesawing back and forth ... I too often hear the most amazing sexist BS coming out of the mouths of people half my age.