Threesomes and foursomes.
Rick,
Similar experiences I'm always surprise how the WGs gravitate to my wife. I don't know why but I'm not complaining. For me one of the coolest aspects of having especially Chinese group gropes is when the girls sit around chatting naked at the breaks and after. I speak some Chinese so I can follow maybe 50% of the conversation. For me it must be tied to the girls sorority / slumber party fantasy I have had most of my life! Aside from the sex this is my favorite part.
I think rules are very specific to the couple. You and I have had very different experiences with our respective gals but, that is what appears to work for each. I think we would both agree having a Bi woman is better than not having one at least that's how I feel. With that said I do like your arrangement. Congrats.
I would point out a Bi-gf is not for everyone. I have a good friend who has been in Asia for 10years and has had his share of 3 and 4ps but with his serious gfs it is strictly monogamous. The funny thing is that he met his current love at a 3p their first and last! Go figure!