Give me a break, "Bukkake Bucks" doesn't have a single Japanese site.
I think its almost a fucking insult, they would open a program like that and exclude a real bukkake site.
Regardless Bukkake is becoming popular in Western countries and bukkake bucks has some nice sites, though it isn't suited for .jp traffic.
If you want to try a bukkake sponsor for asian traffic go with:
http://www.bukkake-bath.com/referral.html
Finding an actual japanese program would be better though.