I TOTALLY agree with Sweetdevil. Intimacy is what swinging is all about. We are becoming intimate in some shape or form with another couple / human being. Yes, kissing has its layers, but kissing is play. We kiss one another for many different reasons. There are innocent kisses and there are not-so-innocent kisses. Why can't one kiss differently when involved in play? I think kissing is also necessary to provide some sort of feedback with a playmate. It may provide honesty and a sense of trust with a playmate. How many people have you kissed (at anytime in your life) and just have KNOWN they are up to no good?
(my $.02)