One of the things that sets most japanese anime(even the Hentai) above american cartoons and animation are the exceptional voice acting. For some reason someone thought it would sell more copies of Hentai by using porn stars for the english dubs on some of the popular Hentai titles...off hand I think "Blackmail" and "Immoral Sisters" were 2 series that did that. It just make the english dubs even more unbearable than usual.