I know.
But even with dating I've noticed there not as much moralcy or something surrounding things as in the west.
I'm not in an way brining up the stupid 'japanese girls are easy' falacy.
I've dated two girls in Japan (well three, but Sayaka the english language leech doesn't count). Both seemed to have no qualms about moving fast. One was touch and go because on our first date I said she couldn't come to my house for the night because I had an early start next day, and I myself didn't think it was wholy appropriate considering it was just a dinner and quite few drinks at a restaurant. She got angry. Took some time to see her again.
By our third date she was already saying I'm her boyfriend.