actually the "no kissing" rule isn't just something that some swingers have come up with... remember the movie "Pretty Woman" with Julia Roberts? Her character, the hooker, has a no-kissing policy. And that is actually a normal rule for hookers because kissing actually gets them involved in the situation and makes it hard for them to keep seperated from their "job".
Maybe those swingers who have the "no kissing" policy are worried about getting too involved with the person they are playing with. Maybe one half of the couple is worried that their partner will kiss this other person more deeply than they kiss them. A blowjob is a blowjob.. but a kiss is not always just a kiss.. there are many different kinds of kisses that denote different things to different people.
Julie
http://www.swingersboard.com