Kinda random, but when someone can't kiss, but I am attempting to salvage the remnants of the evening, I'll pull back and say, 'Let me kiss you.' And then I take the lead and if they try to respond (think "dead fish flopping all over the place"-- or in this case, tongue flopping all over the place!), I pull away and say, "Uh uh... just relax and let me kiss YOU." Eventually, they get the hint that French Kissing isn't a knock out, drag out fight to give you an emergency tonsillectomy. Works like a charm. I highly recommend it, and when they get into the rhythym of how it's supposed to work, I give myself a pat on the back and a gold star for teaching them a very valuable skill.
Hmmm, I'm soooo modest!