I visited Japan over a decade ago and it seemed like everywhere i turned there was anime and manga and adults reading it.<p>I stayed a couple of nights in an inn as well and there were several shelves of manga (mostly hentai) on the bookshelf in the waiting room.<p>Also all of my Japanese friends  in America (admittedly they were in their teens) were into manga and anime.<p>I think its a pretty well known and accepted fact that anime and manga are popular among all age groups in Japan.<p>They also seem to be fine (at least more fine than midwest America) with softcore porn.
There was a lot of waste-up porn on news stands and I saw a row of Japanese men looking at more explicit porn mags in a bookstore in front of the magazine rack like it was a sunday paper -- totally nonchalant.<p>edit: fixed paragraph layout and spelling