User blog comment:B214/Kuoh Academy students finding out that Issei stays with the ORC girls and is dating Rias./@comment-24098614-20131215011722/@comment-98.93.247.105-20131216081620

While the girls know about Issei's porn collection, there is a silver lining that I can see from that situation. That silver lining is ..... the girls could use it to help identify Issei's fetishes. That is to say, Issei's porn collection could be used as a form of reference material to Rias & company in regards to his - erotic - likes and dislikes. It might be embarassing to him, but to anyone who has read the story, we know that such action is not beyond the girls in his harem, in particular Rias and Akeno. Especially in light of Akeno's conversation prior to the start of the Rating Game in volume 5 and subsequent erotic cosplaying in volume 6.