Originally Posted by
aussiegaigin
Japanese people don't like losing face, getting into uncomfortable situations. She probably feels she has failed you, and would rather not confront you again because of your possible feelings towards her. Japanese social culture is very complicated, it goes much deeper than just being fluent in the language.
Most J girls have no inhibitions about sex, it is another natural function. I have dated many J girls over the years, and I found that if I didn't bed them on the first date (or at least make an attempt), I mightn't get a second chance. They assume you don't find them attractive enough to try, so don't want to suffer a second time.