User blog comment:Jopjopjop/Volume 20 Spoilers/@comment-178.128.187.173-20150907153848/@comment-26865730-20150907210132

Definitely. But not sex if that's what you mean. Nope, our brilliant warrior/idiot still cannot see the girls for the Oppai. (Forest for the trees... Get it?)

Although as a side note, it seems Rias has become even more confident in their relationship as well as accepting of Asia's love for Issei and her special placve in Issei's family.

Plus, with this volume, I've finally come to realize that everytime I've thought "How long is it gonna take Issei to get busy "haremizing" (*cough*) his harem?  This is pushing the idiot-savant thing too far, way too far." I have actually been selling Ishibumi-san short.

As Issei has gone through each significant power-up it has only been because of his "sincerety". I don't think Issei's character would have been able to receive the blessing of the Oppai Goddess or that of Ophis if he was already involved completely with the girls. I think he would be torn in a dozen different directions and would not have been resurrected or been suitable to bond with Ophis. At least not the pure God-sama  Ishibumi-san has written her as.

I guess I'm saying that I've accepted this as part of Issei's growth arc. I'm actually hoping the innocense continues because once that is over, even if Ishibumi-san were to continue (College-DxD anyone?), then Issei would change so much that this would really become a different LN. In the DxD-verse as written, Issei never would have come so far if he wasn't exactly the idiot that he is.