User blog comment:B214/Question and Answers 3/@comment-72.211.217.183-20140921040341/@comment-24502975-20140921163345

To show him that they don't like what's going on. And as has been said, I much prefer this realistic method over the crazy stuff that other harem series have (yet another reason DxD is no ordinary ecchi).

Also, his density has gradually decreased immensely after volume 10, I'd say by now he isn't even dense at all anymore.