Ahhhh, Spoomonkey, thanks for the laugh!
Maybe "heated" was too strong a term. A little back and forth and then we Surrender . It was funny though because they kept insisting that "soft swap" was THE term for two couples doing bi-fem play and only one male allowed (and expecting) to play with both females because one of the females has no interest in any male other than her hubby. Too one-sided for us. :rollseyes Whatever! head bang I don't see the "swap" part, possibly "soft swing", 3some - definite.
We have also done threesomes like you mentioned, alternating partners between full-swap couples. In fact I am doing that now while J's deployed. Two couples we know well, and I occasionally join them as the ever elusive single bi-fem. We'll switch around when he gets back home, so he'll get his FMF's and we'll all be even!
We also plan some MFM's too...and FFFM's and a mini gang bang too!
~M, the female half