They also dislike women who behave raucously since in Japanese culture both men and women are expected to maintain social decorum and propriety.
So a woman who swears and makes gross jokes around a Japanese man may be considered ill-mannered and unattractive.
In fact traditionally women in Japanese society were expected to be demure, graceful and soft-spoken.
And while Japanese women are an integral part of the public sphere now, they still prefer a feminine appearance over a pantsuits and faded jeans.
Thus you may find your male Japanese friend behaving with some formality even in social or in casual settings.
This is not so much because he is not interested in you but because it is his way of treating a lady, or any acquaintance for that matter with respect.
Sometimes this formality may take the form of indirect communication where he may enquire about your work, schedule and family before asking for your phone number.
This kind of indirectness is also evident during conversations, for instance you may be discussing a topic like economic recession or environmental degradation and you may notice he won't directly give his opinion on the matter.
Rather private people Being a formal and still conservative society, open expression of feelings is not really common in Japanese culture.Japan is an amazing country in the way its culture incorporates both the ancient as well as the uber-advanced.So here you can find people still taking part in age-old formal tea ceremony while leading the world in robotic technology.Most probably this could be your last chance since you might be embarrassing him if you do not accept the date.And the whole point of all the formality in Japanese culture is an effort to avoid embarrassment at all costs.