DFK is sucking face.  LFK is when she is just humoring you...

and let me tell you sir...... no just kidding.  I've never exactly understood the difference either.  

This is the best kind of kissing, but I'm not sure if it's DFK or LFK or both??? Hmmm

its called the "self-help center" located on the top right of the newbie board.

and if you don't know the difference
you're correct-------you don't know
JACK_SCHITT

call me so i could set you straight. i'm
told that theres no confusion between the
two with me.

while DFK is insertion of the tongues into each others mouths.

There is a gray area where the tongues touch and don't necessarily go past the others' lips too.

Maybe there needs to be a MFK (medium French kissing) added to the list.

In any case, take your cue from the gal and if she is receptive to more and you are interested, go for it.

Be sure your mouth is squeeky clean before hand and you use a good strong breath mint or drops.

LFK is light touching of the tongues, mainly just the tips, while DFK, is both tongues fully emerged in the others mouth... not sure what it is when one tries to play tonsil hockey, as that is something completely different, lol.