There are thousands of "Video and Magazine" stores all over Japan selling porn in all forms, theres Star Channel and others (cable TV channel) which show porn after 12am, go to a Love Hotel and most of the TV channels they have are porn, not to mention the internet (of course) etc, etc, etc...But watch commercial TV stations and go to the local convenience store or magazine/book store, and you'd be forgiven for thinking that Japan doesn't have much in the way of sexually orientated material.
Is that more than any other country? It depends on how hard you want to look.