It is the culture here man. I have been with enough J girls to know. Yea maybe you can do it but they still are not really into it. These are the same girls that are too shy to change clothes in front of you even though you have already seen them naked.
I dont know about any of that other stuff you mentioned. Anyway, troll some expat sites and look into the sex stuff. You will see the same experiences as mine. They have no problem giving oral, but they have a problem receiving it.