Parlors with one page usually prefer tips in advance. I oblige. If I receive good-excellent services, I will add some tip after the session. If not, I do not tip and give her feedback for improvement. Parlors with one or two paragraphs varies for whatever reasons behind their policies may require tip before the session. If I pay for the hf and tip before the session, I usually tell the provider that she may get a little more after the session depending on my satisfaction. Again, parlors with one or two paragraph menus prefer to collect the payment (hf and tip) after the session. All in all, tip before or after varies from parlors to parlors and the trust between the parlors and customers. I know a parlor requiring payment and tip before the session. After building trust, I have been allowed to pay for the hf/tip after the session, which I appreciate them.