It's a feel good thing for sure  😊

you can measure the time you've known them in decades

Yeah, I'm sure a guy would never lie about that.  :-

show her she's your ATF. I had an ATF for 7 years. She got the drift because she understood my budget and availabilty.  

I've subsequently found other ladies that are better suited for me now. A few are ATFs too. For me, it's not a mutually exclusive term.  

One example is a touring lady I see. When she's in town, I'll see her as often as possible and no one else. I could see her every day when she's here.  

As for expanding their menu, my expectations remain the same. It's how they became ATFs in the first place. I wouldn't "expect" much outsude of her comfort range. Adide from tge sex, an ATF has many ways to reciprocate to show her appreciation and/or affection

tell me that she was my ATF..

I think most honbyist don't tell, they just show it

It may make the provider become more complacent though. So it's always a gamble.

too much for you and you want her to dial it back a little on the service.  Its human nature to get comfortable and not try as hard when they know that have a lock on you.  As another poster above says, they will get the picture based on the frequency or duration of visits.  If I am seeing someone for two or three two-hour sessions a week, they are quick to figure out that, while we may not be exclusive, I'm probably seeing them more than anyone else.

Nevertheless, sometimes the service drops off and I have to say something like, "Do you think I'm seeing you too often?  If you're bored with me, just say so and we can take a little vacation from each other because I've noticed lately our lovemaking doesn't have the intensity that it used to have. "  It never fails to make the point that I think they are taking for granted that fact that I will always be there.  In hobbying, I think we live in a world between "all things are possible" and "nothing lasts forever" so I think ATF's need to be reminded periodically how lucky they are to have us.  Successful providers who have built a good business engender respect, consistency and loyalty from their customers through exemplary service, and sometimes need to be reminded of that.

I would love knowing I am someones ATF!

I've been told by a few that I'm their ATF and it makes me feel great
It makes it even better if I feel a genuine connection with the person as well.
AMAZING things can hapoen when two people like one another ;

but I'm sure she knows, because she knows that she's the only one I keep coming back to see.  She knows I keep trying out other ladies, though, and she knows that I also like transsexuals...so she won't get complacent about it.

... you have been, and always shall be, my ATF.  (And my friend, too, but that wasn't the question.)

Why do I tell her?  Why not?  It's the truth.

it's like that old song (bonus points if you can name the broadway show it's from)  

when i'm not near the girl i love, i love the girl i'm near.

unless a girl is a disaster on the second or third date (which happens more than i like), she becomes my atf WHEN I'M WITH HER.  it's just something in my genes.  i love the woman who's loving me at the time.  it's how i roll.

if i've seen a girl for 4 or 5 times, chances are we are clicking, and if we are clicking it's on more than a physical level, so at the point, yes, she becomes my atf, at least when i'm with her.

but in reality, there's one lady i've seen for over 4 years, she's my atf.  but also there are two ladies i've seen in the past few months for over 5 times each, i call them both my atf.  and there's one lady in a city on the opposite coast who used to live in my city, i saw her a number of times and whenever she comes back to town i make it a point to see her.  she's my touring atf.

what can i say, i'm a sucker for a pretty face.

but in answer to the question, i think you should definitely tell the girl she's your atf if you feel that way.  it never hurts to let another human being know that you appreciate and feel good about them and their actions, imo.

I have three ATF.

So yes each lady knows and all of them are very nice woman.

When I am with them - they are my ATF...

But I am a fickle bastard...

Such a tacky title to label on someone....Almost wanna chase it down with brew and some jerky. If I liked my time with someone, I'll just tell them that "I had great time with you and I'd love to see you again"..nuff said....I would think, yes?
And usually the next visits are better then the first.

ATF Provider.

I BBFSCIP with her. So she knows she's my ATF.

Since all of us here start our hobby relationships with several lies, I'm going to have a hard time believing certain things that are said. Things like, You're my favorite. I haven't cum like that in a long time. I love you. Your my first guy in a week. Your the only one I've seen today. On and on. Those are nice, and enhance the session, but really? The other thing you have to remember is that the hobby relationship, for the most part, is a perfect relationship. So our perspectives aren't exactly coming from reality. Lastly, as one of my atfs used to say when I would say something from cloud nine, "Oh, that's just the sex talking. You really don't mean that."  

On the other hand, just like in real life, actions speak volumes. It's been my experience that favorites spend a lot of otc time together. Lunches, dinners, gifts, overnighters, conversation, extra sex, extra emails. On and on. I've never known a great connection not have some sort of otc. So if a lady tells me I'm her favorite over lunch, there's a strong chance I'll believe her. That's not to say that I can't be someone's favorite who is strict with her time. It's just that I'd likely not believe her.