Well, I find this interesting!
We are a NON-kissing couple. It has always been our rule and it has never been a problem, from our standpoint. (Reading your post tho, makes me wonder if I am just oblivious)
Our rule was made as a personal preferance, and it has nothing to do with jealousy. I will also tell you that it has something to do with both of us being smokers and most of our playmates are not. That, too, makes me feel less then confidant in kissing others.
We do not want to passionately kiss others. Playful kissing is ok. We explain this rule first and if there is any hesitation with the other couple, then it is a no go.
Chances are the couple is going to be aware of the rule more than you. We have couples forget a lot and it is no big deal to us- as it is our rule not theirs. It is a matter of a playful reminder to them. After awhile, they remember and it is fine.
Now kissing on the lips is the only thing that is out.... kissing other places is just fine
