If a anime character exposed his/her sex organs(sexposed), having sex, using sex toys, they will be a hentai.
Hentai are drawn unofficially by fans not by anime company.
Some people jack off with hentai, some said that sicks, and I and some people laugh at their huge boner. I edited Ash's boner on a hentai image to a rocket.
hentai's live without social interaction just for sex.
hentai will rape anyone without any guilt conscious or consequences.
hentai don't even spare relationships such as mother and son, father and daughter, sister and brother etc.
hentai shows professionals without ethics
Simply its anime porn.
A common practice in hentai is to stretch the sex acts beyond the beyonds of normal human sex.
Jonathan: "Sigh, she's at it again"
Zenas: "Her fantasies through the internet is just not right"
Kristine: "What?! NO! I'm..I'm playing tetris!"
Jonathan & Zenas: "She's a hentai fanatic"