Based on this
ad, it ranges from 30,000円〜100,000円 depending on the scene. I guess low-end pay is for masturbation/hand-job and high-end for gay sex. From what I read, they also don't get royalties/residuals from the sales of their videos/DVDs. With the high inflation and weak Japanese Yen, models now are earning way less than ever.
As for Itto's case, I think he got the same standard rate only for the videos he filmed last year (from Cruising to Dead Drunk Obscenity) prior to his debut last December.
When Itto was asked to do a "ceremonial masturbation" after receiving his G@mes Best New Comer Award, before agreeing to do it, he checked first that he will be given a salary. Sad.
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Of course now that he's popular, G@mes is spoiling him, agreeing to his demands (no more anal? Lol) as long as he stay on board as an exclusive model.