...if you look at it from the Quentin Tarantino perspective--I know, but stay with me...for that one Kill Bill movie when asked what made him do the animated scene about Oren Ishii's childhood, he said that by doing it in animation, he could accentuate various elements such as blood, pain, facial expressions, etc, that he couldn't replicate in real life.  I think in porn, it allows the creator to accentuate ass, tits, cock size, proportions, orgasms, fantasy, etc to a point that is unreal.  The few (3-4) hen tai scenes I've seen had screen captures that displayed something unattainable under most circumstances in real life porn.  Whether it's the woman's proportions or the ability for her to down a massively sized cock or whatever.

Just a perspective.  Others may see it differently.

Yippie Kiyay,

Rodeo

Does any fetish really have an explanation?  I've watched (and gotten off) on hentai/cartoon porn from time to time.  It's not my staple by any means.  But, on a few occasions I've run across a video that just gets me going.  It's all about fantasy.  

One of the very first providers I saw looked very Marylin Monroe in her photos.  It wasn't until we were face to face that I found out she had lots of tattoos.  I'd never been with a heavily tatt'd up chick...and it absolutely turned me on.  I can't explain why.  Now I look for it.

I'm going to assume its based off a need for control. In hentai/anime, a persona can create their ideal image of a women and what she's doing. In these cartoons 99% of the time these girls are submissive and either go along with what's happening or are forced. Either one can be a turn on for the right person watching or creating. Plus, the girls are put in situations that aren't normal: 10 inch monster cocks being stuffed in a girl, huge (DDD/HHH/LL?) breasts and size 20 waists, etc.  

It's different.

Hentai anime allows for greater narrative depth and character interaction than is finacially or legally feasible in live action hardcore pornography.  On the occasions when a hentai manga (comic) is adapted into both anime and live-action projects (such as Weather Report Girl), the anime is always hardcore and the movie is always softcore (allowing it initial theatrical release and eventual television broadcast).

You were a normal OP, I'd point out something the whole Japanese sex culture. But it's you.  

I think it has to do with Japanese porn laws

I believe it has to do with censorship laws in Japan. Like how most Japanese porn has the penetration blurred. 2 actual people having sex, it has to be blurred. Cartoon people or people fucking robots or squids or robot squids cool.