@ Owen I think it has something to do with the fact that sex in Japan is all about the man. The women is there to please and that's it . This is what they expect to see so that is what they get. The "Bukkake" also came from Japan (probably the best thing other
then the women <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />) it is a form of punishment or shaming. So it's basically Japanese guys are boring sexually so their porn is too.
<img src="/ubbthreads/images/graemlins/devil1.gif" alt="" />