How do folks feel about DFK in the hobby? I never used to think much about it, and really enjoyed it as it added an intensity to the GFE experience. That was until recently when I started thinking about how her mouth was just down another guys shaft not too long ago. (Frickin brain is trying to kill my mojo!)

Pre-Covid DFK was part of my initial greeting on walking into the room.  After taking off my jacket, spend a few minutes hugging and kissing, squeezing her ass while standing by the door.  This was my way of building connection and DFK was a good part of this.  I have not done any DFK since Covid.

If you concentrate on all the germs, etc. you're going to face every time you see a gal, or for that matter, go out and dine at a restaurant, or shower at the gym, etc., you'll never get out of bed.

and seek out those who are open to it as well..  

Being a very passionate sensual kinda of guy, it’s a major part of foreplay. My motor can’t rev up without it.
And I don’t give it a thought to where her mouth was a couple of hours ago.. I know what I’m getting into here.

see a provider that did not have DFK on her menu, but it puts me off of DFK if they still have semen on their breath from the last customer.  It’s only happened a couple of times where I had to ask one to go rinse with some mouthwash.

You must have a K-9 sense of smell, unless she forgot to spit from the customer 20 minutes prior.  In which case, snowballing is DEFINITELY not on the menu.  Kudos for you making her rinse.  I'd probably hit it doggy and got the F out.  

How would you know what semen on a providers' breath tastes like, unless you've experienced it often?

Without DFK, I'd still be doing One-Jackson car dates on the local stroll.

In my experience if provider doesn't DFK it's a sign that she doesn't do few other things too and also that the girl has a good chance of ending up being a cold fish while I like my cup of tea hot.  

I'm not the kinda client who's just there to "stick it in a warm, wet hole," bust a nut, and leave.

I look for DFK and CIM or it isn't GFE to me.  
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What I can't believe are the number of Providers seeking 7, 8, 9, 10 bills for "Kiss: No or Yes - w/o tongue" and "CIM: NO."

It's a beautiful part of foreplay, and I've been known to want it during and in afterglow.

semen of my own in providers' mouths to know what their breath smells like after CIM, and before they rinse.  

Well  said Steph. I totally agree!

in order to have a completely enjoyable date.  

and have not a care about who else she has kissed.