Even though I don't have a no kissing rule in place for NDN when he plays, I will admit that while I'm ok with him going down on a woman, her going down on him or him having intercourse with her, I get a sick feeling in my stomach when I see him in a passionate kiss with his play partner. I guess it's because when I kiss him I get butterflies and a feeling of total love that washes over me, but with sex it's just pretty much just a way to satisfy a physical need.
I'm guessing that's how a lot (if not most) non-kissing couples see it. For them (and me too) a passionate kiss is an expression of deep love. I don't think it's a stupid rule as was stated earlier. No rule is stupid if it's put in place as a way to feel more comfortable and secure. All you have to do is find others with similar rules and there ya go!
*just to clarify, I am not responding to this thread as if other posters are talking about me or to me (as was suggested in a recent thread I commented on). I'm just using my own life as an example as I've seen done countless times by others on this board. Thank you.