Exactly! It wasn't my key interest to get laid while in Japan, but of course the curiosity was there.
In Japan you're always "Gaijin", even if you can speak good Japanese, know the etiquette etc..
If one wants to have fun with Asian women, it's almost better to stay "home" and try the tourist people!

While one is in her or his own country, there can be very strong inhibitions. When abroad those inhibitions can drop and people might do things they wouldn't do in their own country.