[Dynasty Warrior]

Here's the thing, not all manga are just plain hentai. There are plenty of "clean" manga out there that can be read by pretty much all ages (unless there's some violence although it doesn't look as bad as if you were to watch it on TV).

Yes there are probably a good chunk of manga as well that contain hentai elements and those are all the "H-type" stuff. Also as mentioned, doujinshi you could associate with "fan service". It can contain H-stuff but it's certainly not limited to that although people seem to associate "fan service" in that sense.

The bottom line is, NEVER generalize manga as just being "sex comics". As somewhat of a manga collector myself, I have a few different types of manga. I have ones that range from being anime-based to ones that are almost unheard of. In fact, one of the series I'm working on completing could probably work as an anime. Also, I do own one "non-Japanese" manga series in the form of it being based off the Warcraft Universe.