I'm in no way bi - but everyone so far is right. To fully give the wife the MMF experience, you have to be willing to ignore a little brush now and then. The closest I've ever gotten with another guy was when Mrs Spoomonkey wanted to try a double oral on the two of us. In a MMF, even the husband needs to be willing to play "stunt cock" if need be.
I like playing with couples who understand that a brush is not a "signal."
Besides, quite a bit of swinging is "sexual theatre", really. You have to know your part and play it well. Now - if I could just get cast as "handsome leading man" I'd be happy
Spoomonkey