I'm going to be in NY early April.  I was planning on going to Julies for a little recreation.
I've got their general fees but was wondering about tipping.  do you generally tip the girls after the session and if so what is standard.
Any help is appreciated.

Just FYI, if a provider does more than go through the motions, I see no reason not to. Nothing crazy: $50 or more as a way of saying "thanks" and being a gentleman.  The surest way to NOT get a tip from me is to hustle for one.

just my .02:  your mileage my vary.  Objects are closer than they appear to be.

You picked the best agency in nyc!  Can't go wrong with Julies girls they are well liked!

I've become a regular at Julie's over the past 3 months (been there 8 times).  It is customary among the "regulars" that a 20 or 25% tip is customary, if you enjoy the services.  The girls are all different in style and performance.  Read the reviews and pick any one.  I've never had a bad time there.  Good Luck!