I'm saying that in my (fairly extensive) experience of living in Japan and having Japanese girlfriends, a big turn off for them seems to be boastfulness and an arrogance. Of the women I dated I can't remember boasting about my wealth or IQ as it seemed totally inappropriate and I imagined it would be a huge turn off for the women. Japan is a humble society interested in 'wa' or harmony. My observations are that American-style shameless boasting tends not to be seen as very attractive, and shameful. No Japanese woman wants a boyfriend that her girlfriends hate. On prick size, I am not hugely endowed myself, but it was never an issue with the women I slept with.