For those bogged down in semantics, let's play nice and allow someone to have more than one if they'd like. It doesn't hurt anyone if they do, right. But I guess you can be an asshole too if you'd like considering this is an open forum.  

Over the past decade plus, I've known and loved several ladies who fit the term.  Several of them are on my review list, and though these were posted years ago, all are still active.  This list is not all inclusive, though...at this point, I don't need to review, and when I need for references, the list is far in excess.  P411 also helps in the reference game, and I have my bases covered there.

...and I find myself saying, "Too bad so'n'so'n'so ain't in town," then I know who is my all-time favorite.

as you do about ATFs. But there are several ways a session can be a 10 that a previous 10 didn't. Case in point, my first time with a squirter. Or the gal who was also an ATF that schooled me in anal.
Or the 15 min. rolling orgasm from a gal that gave me the singular best BBBJ ever. Or the dynamo that could cum from a guy sucking her breasts. Or the gal with the best deep throat skills.

A favorite is just someone I want to see over and over again, which is what I do with almost all the gals I see.

someone you feel sincerely and genuinely enjoys and looks forward to the time you spend together - as much as you look forward to it and enjoy it. The person you would choose to spend time with first, given all choices were equally available.  

If we were to call it my "current favorite" or even "favorite at the time" I could live with that, but for the very reason/s you have cited, ATF is one of those terms I despise and refuse to use.

a "favorite" is a "favorite"; the idea that there can only be one for "all time" is definitely untrue and pointless

For me, the only true "10" is Sophia Loren when she was about 30. But giving less than 10 to a provider who's just incredible messes up the system. Your idea would solve that problem.

Says, "You're my boyfriend now, so you don't have to give a donation anymore."  It only happened twice, but lasted for months in both instances, so needless to say, only two ATF's  for me. I usually have a CF (current favorite) out of the girls I'm regular with.

Did they end with a bang, or with a whimper?

About six months because I would start sneaking sessions with other girls and they found out. Never underestimate the Kgirl network. It was completely my fault both times. When giving it to me for free, they expect exclusivity on my part.  Seems narrow-minded to me. I was only seeing someone else a couple times a month and I was seeing these girls three or four times a week, so it's clear I was ALMOST completely committed to them.

I wish I could say the same about my civvy breakups.

When I talk with her, I know I'm talking with the actual person, not some put-on provider persona.  She has no pretense.   She's completely honest with me, and I with her.  We can talk about anything, because we trust each other completely. We know each other's likes and dislikes, so every "date" is fun because we focus on the likes and avoid the dislikes.

well put. being honest about dislikes and making feel like your talking to a real person . i had one provider who did this and was on way to becoming atf, but didn't

imo the words accompanying the numerical scores are superfluous literary decoration, word groups that help qualify the numbers.  so to me, "once in a lifetime" is just hyperbole like when i say "this is the best burger i ever tasted!"  it may or may not be overall, but at that moment, it is.

see my tome above about "once in a lifetime."

although my definition is less "all time favorite" and more like "who i like to see more than twice."

aesthetic quality.

... re "ATF" with this joke, which was funny the first time someone used it but was worn out many threads ago. Surely you can think of a more original way to show your disdain for the idea of "all time favorite."

Who was it that gave you the best deep throat ever? Looking for a replacement to the one I had who retired. At least Cathy Heaven is still out there.

Shit with one of my current favorites I need an app to talk to her. Most everything else needs no words. But she is really sweet

She is my ATF because she works for the Bureau of Alcohol, Tobacco, Firearms and Explosives on the side.  

It says automatic transmission fluid on the bottle. Then look up type in owners manual. Newer ones have a a sealed off system.

I don't have an ATF, but I have a lot of ATM girls. At The Moment. My definition of ATM is a hot 18-22 yo white chick, 120 lbs. or less, who lets me inseminate her cervix and her tonsils, and will keep doing so until the next ATM comes next, which usually doesn't take very long.