Well, I never said I liked the tentacle rape scenes. I was just pointing out an example of something which you'll never see in live action.
Don't know anything about Japanese penis size, but I mentioned that yes, the women have small breasts. In hentai, the breasts are larger.
Hentai is...interesting, IMO. I don't use porno much, but I have no problem with a hentai which happens to have a good plot. (Okay, I do have a problem with Urotsukidoji, but only because of the aforementioned tentacles.)