I would say a definite "maybe" lol

 
Before answering I would have to know if you are young, and are able to "recharge" quickly, or if you are more of a "one and done" kind of guy?

 
Here is why I ask. If you can recharge quickly than my advice would be to research providers that allow MSOG, this way you can get your first pop out of the way early, enjoy a bit of down time, and then have plenty of time to have a more leisurely second go at it. So if that is the case I would NOT advise rubbing one out before a session.

 
Now OTOH, if you are kind of a "one and done" kind of a guy who needs more than 10-20 minutes to recharge then it might indeed be helpful to get the "easy one" out of the way yourself maybe the morning of the day you are having a session, giving yourself plenty of time to be ready to go again of course.

 
There are other ways of course to last longer, one is to simply have more sex, but that's not an option for everyone. Another is to desensitive yourself a bit with a couple of drinks, or to take a small dosage of a ED med like Viagra which has the side effect for many of us who don't need it of making it harder to cum. Personally I hate to jerk off, I am pushing 60 and I only have so many orgasms left in me, I hate to waste any of them on anything less than a beautiful woman. lol

... then one piece of advice:  don't do it in the car right before the date.  

Funny story about that:  a provider I know pretty well and who likes to help her clients hang up their clothes told me that one guy had some white sticky stuff on the front of his pants, near the zipper.  Not knowing what it was, she asked him if he knew thae stuff was on his pants, and he turned red and fessed up that he'd jacked off right before he arrived so he'd last longer.  

Good advice above, especially about seeing providers who allow MSOG. My favorite provider take on that was when I asked one of my favs if she'd like to do anything in particular during our two hour date, and she smiled and said "Make you come ten times."  THAT wasn't going to happen, and she knew it, but if you find providers with that kind of attitude, you're golden.

-- Modified on 3/18/2018 6:47:48 PM

It turned out to be a great way to avoid PE.

 
Now that I'm in my 60s, I need to save up for a week.

I've only seen providers that allow MSOG, so I know I'm good for at least a couple every session.  I do rub one out before the appointment, mainly because the anticipation has me thinking constantly about it and I get all revved up.  

 
But I never do it the day of the appointment.  I don't know why, I just never do.