The ladies aren't used to giving full service so they don't regularly clean themselves down there the way the women at FS places do. There will be an odor.
Don't expect to get full service for anything less than two bills. They don't usually do it so don't expect it to happen for anything less than that. 200 seems to be the magic number, and that is the tip on top of the house fee. Don't go into a subamp with anything less than a 200 tip and expect anything to happen.
And even then they can probably make that up with half a days work, so if they aren't attracted to you in some form, even then it can not happen.
Don't be a dirty old groper. Take it slow, let the tension build up. Be a gentleman. A touch here and there. If the lady feels uncomfortable she will not want to go all the way with you.
Be clean. Don't be a fatass. If you don't like what you see in the mirror, chances are the ladies won't either.
Also, don't fuck and tell. The last thing these women want is a whole bunch of horny fucks knocking on the door for FS with 100 dollars in their hand right after giving FS to you. They can probably surmise who it was that let the cat out the bag, and the next time they see you, you will probably be denied. You got laid. Take it in stride. And keep your mouth shut.
Happy hunting.