According to health reports, the average vag depth of a women is roughly 4 inches. Probably smaller for asian girls. Like one gentlemen used to say: it's not the size of the boat, it's the motion of the ocean
Statistics are great but they are just that statistics..
I have seen a 4ft 6inch girl take a 12inch cock all the way in.
To say that Asian girls have smaller uterine canal is not too smart, just because they are mostly petite does not equate to small internally. I was married before my wife also Japanese from Okinawa could take all of me in , also I bought her a Sybian with 10 inch massager she could put it all in. My now ex-wife was just shy of 5 ft tall and weighed 95lbs American weight.
I hope you visit Japan and experience a true GFE with Nuru massage it’s priceless and you will never forget it.
Girls get tested regularly, they must provide their card making then legal to work.
We have sex hotels in most of Japan, girls can become legal at 19 but they are pricey...
Sorry for late response, I’ve had many meetings lately.