You should watch some japanese porn movies... ussually the guys are fat or really bad-looking, because it's a yakuza bussines and the boys of the gang want to make the dirty work to have some fun..., the forget it, if you are foreigner and not a gang member... you wont have any chance.
I've always had a very high sex-drive and I contemplated it while I was living in Japan. I even went so far as to write (!! lol) a bunch of scenarios that may have fit in with Prestige-style productions.
It annoys me when I see some of the male JAV participants who can't get hard or can only jizz like a runny nose. I'd be perfect for the studios; I love women, I have trouble keeping mine down and I go off like a bomb in a yoghurt factory!!