If the criteria for choosing Japanese male pornstars was penis-length in excess of 7 inches, there would be ZERO Japanese male pornstars. In this Age of Viagra erection durability is not the criteria it was just 10 years ago, the criteria for having a successful career in porno acting is to get along off-camera with
03) the producers
02) the directors
01) the actresses
Don't think that a porn actress (even a Japanese one) can't have a guy fired from the set if she can't stand him. The actresses are paid to ACT like they love fucking a guy. Most of the time, they forget about how good a fuck the guy was within a week of working with him. What sticks in her mind is how comfortable he made her feel during the time spent off-camera.