If you are a Black guy, ask yourself whether you get turned on by a sex scene between a good looking Japanese guy and a very seductive and eager Black girl, Azn lovin sista. Most Black guys I know don't. You should expect the same for Japanese guys, otherwise you are incorrigibly conceited and racist. It does not sell well among Japanese males who make up 99 percent of the market.
If you go to IR forums like now-dead Mr Marcus', you will see that most Black guys are disgusted by White actresses who do JAV and try to blackmail them as "traitors". I don't know if they are serious or they are sort of joking but they surely don't like Asian men and people. If in doubt watch all those NYC vids where 300 pound Black thugs beat up on old Asian ladies.