I never heard it used for Hentai, before. I've only heard "H" used for that, as in "H-manga" and "H-doujinshi" and I believe Hentai applies to all kinds of explicit anime and manga (though I think it is mostly for het, as they use "yaoi" for the explicit m/m stuff). There's also "Ecchi" in...
One time, in the shoutbox, I was talking about fanfiction and people got very confused when I was saying stuff like "Oh, it's a gen fic and this other one is het."
I've been writing fan fiction for various things I like for about ten years now and being "in fan fiction writing culture" I've...
Genre Guide
The following applies more to fan fiction than to fan art, but it can apply there, too. Creative fandom has its own language which can be confusing to newcomers, so here is an explanation of various genres that may be helpful in labeling and finding an audience for your work...