Well, to be honest, the swinging community in general isnt very open to bi male activity. It happens, and plenty of people do it, but it's not something you will see people openly talking about at parties or hear people expressing desires for in an open setting.
With that said, Im not sure if there are other communities where you would be more welcome. Ive had a limited amount of contact with the gay and lesbian communities, and they are pretty much the same, albeit in their own way.
Keep in mind you can find groups of swingers open to your mindset, but you do have the chips stacked against you.
Just keep plugging away, maybe try some local swinger sites in your area, but expect quite a few "no's"