Do you guys live in Tokyo? Because usually I don't receive such direct questions. They may assume those things, but I usually get asked a more general " what do you do" and "where do you come from".
That said, I do get complemented on doing really basic things like writing my address or using chopsticks by strangers and colleagues alike.
Yup yup, that too :)
I've lived in Nara, Osaka, Yokohama and Tokyo, so everywhere it has been the same. The girlfriend questions too. But, over the years it has gone down because I get older and probably look like I do something else. Not too often though, only with new people on the streets/bars.
Oh boy are the videos from Osaka crazy. Will go there next week so will check out how the cleaning is going.