Why is DFK considered GFE...kissing can be one of the most sexual acts. Many do not know how to do it. I've been told many times, " I love the way you kiss ". It wasn't DFK.
Is DFK simply opening your mouth wide and tongue bashing one another? I've had people do this. Silly, close your mouth. Let me me suck your lips, slowly and softly letting you know I'm so glad you're here. Glance into my eyes and keep kissing my lips.
Shoving my tongue down someones throat is not the way I say "Hello". Grabbing you, putting my fingers thru your hair, nibbling at your ear and gently down your neck, back to your lips gently and pulling them in.
DFK, in my opinion, is an over-rated high school means of kissing...unless, there is sex involved. Then, you might get a whole lot of tongue action.
Back to the my subject line...yes, when I have your cock in my mouth...there's also tons of DFKing going on there.
That's just my GFE experience in real life.