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Agreed. It's what makes the difference between a comic like, say, Homo Sexience or MeRanCoRi (which is within a group of comics/comic artists that tend to have a bit more of a lewd approach to their comics, but again, in a comedic sense) and a hentai manga you'd find on coughs fakku.net coughs
If it's a comedic approach (and even Homo Sexience and MeRanCoRi as I mentioned above doesn't go crazy with the nudity, it's mostly just -implied- nudity most of the time, although some comics have had full-on nudity, but mostly just with the female characters) then some nudity and sexual innuendos are considered NSFW but not quite pornographic.
Whereas if it were something like the published hentai manga where it's not meant to be comedic (well SOME of them are kinda silly but that's beside the point) but made to be used as a form of arousal for the reader and nothing else, then yes, that's pornographic (and pornographic manga/stories have lots more nudity in it and breaks the barriers of "implied" nudity).
Ya that's my two cents on that lol