So how old is this guy? Because all I'm seeing is someone that's involved in a 3some, not a poly relationship. He's living every man's dream and that's all he can think about. I used to be more selfish when I was younger until I realized that it's AS MUCH FUN TO PLEASE MY PARTNERS AS IT IS TO HAVE THEM PLEASE ME!!! What a concept!!!
Ok, didn't mean to be that sarcastic, but he's obviously being VERY selfish in the bedroom and he needs to be told. It's not going to be a pleasant conversation but if you both feel the same way, then maybe having you both sit him down and have a frank talk will hit home. Or he could feel that you're both attacking him. If that's the case then maybe you should drop him and you and your gf should find someone who'll be a bit more fair.
Just my 2 cents.