Hi

Don't know why they are like that.. but you are right.

I know they don't like talking about anything negative because they don't want to bring anyone down.. (complaining or not coping is not cool here either)
and they don't like talking about sex and stuff because they think that makes them look cheap..

So maybe if you take those things out, it makes have a close relationship hard...

My friend says Japanese people are robots.. bit harsh but he has a point maybe..