One of the anime types mentioned is 'anime' porn ...

My observation, supported by a number of others with similarly limited opportunity for observation, is that Japanese "culture" is rather "inhibited" compared to western ones. Just as cartoons/caricatures were extremely popular "porn formats" in the US and Europe ca 1830 - 1930 or so, partly due to the absence of other media, current or at least recent Japanese have little access to "live porn" (I've been told it's mostly illegal) but there's no visible restriction on "cartoon porn."

On my one very limited visit to Japan I, and the group I travelled with, were "impressed(?)" with the nearly ubiquitous and highly visible display of "hentai" at shops throughout the business sections of the city. I don't know how many of the others in the group noticed the nearly absolute absence of anything "realistic" (art or photo, etc) that was even mildly "suggestive."

Our own ancestors, one or two - or more - generations back, got a pretty good kick out of some incredibly "rude" cartoons. That genre hasn't exactly disappeared here, but it's definitely not very visible now (among any people I know).

John