Is it common courtesy to let a girl know that your baby batter is about to line her mouth, throat, and face when receiving amazing bb  oral or do you just let it explode? Every gal is different. Do they want a warning signal or not?  

She even takes "baby batter" to the face, mouth or throat.  Hopefully you've read her reviews to see if that's even an option, if it is I think it's only fair to at least give an "oh shit I'm about to cum."  

Especially if her menu says she doesn't do CIM.  If a girl prefers not to CIM and you do it she will very likely not see you again. That said, most know from experience when it's about to happen because of pre-cum and your groaning and convulsions. But it's best to be sure.

She will probably know that you are about to cum.

Your handle to Rookie-at-everything.  You don't have to say anything unless they're new in the business. Experienced providers know. If they don't want CIM, they will switch to HJ at the end.

I am more experienced than most think. It's been good fodder for discussion. Thx though. I am always up for learning something new.

Sorry, not my phrase, just something I read on another board.

Yes I appreciate that!!! I CIM but don't swallow!!! Also I appreciate those drink sweet stuff to make sure their "baby batter" isn't funky!!! Lol

I know a provider who is by profile and reviews CBJ.  The first few times I saw her, she used a cover and she gives a great BJ even with the cover. Then one day she started in on junior without the cover. She looked at me and said, "Let me know when you're going to come, ok?"  Of course I did. I found out that day that the only reason she does CBJs is that she hates cum in her mouth, but once she trusts the guy not to come in her mouth, she does BBBJs.

...even if I'm pretty sure they will know what's about to happen. Since BBBJ is a must-have for me, it's usually a topic that has been covered before our appointment but the Big Finish is usually YMMV. Once all the other factors line up, I still let her know that I'm close -- I'd rather over communicate than under communicate.