Of core GFE services (BBBJ, DATY, DFK, MSOG), DFK has always been the most YMMV of them. If you are a guy who it's make or break that you have it, you have no idea how badly you are fucking yourselves in the ass, because some girls do come around on it after they get to know you. Highly YMMV and any well experienced person knows this.
I got no choice but to agree. It is indeed YMMV. I prefer asking first and if I get a clear no, I'll probably seek someone else. I don't want to impose my desire to someone of they don't feel ok with it.
From a meeting, I seek warmth, kindness and sensuality. Usually, I can tell after a few words on the phone or a couple emails if it has chances of happening or not. DFK is one thing I do want, but I will overlook that if I feel the rest will be there. I see it as a great headstart for an enjoyable encounter. But, as I said, if the other person is not ok with it, I'd rather book with someone else as these meetings are always a lot more fun when both parties are enjoying it and are confortable with each other.