Also, sometimes "no" means "more tips". Or "no" means not today for a certain reason. Or sometimes "no" means not the first time with you. Or "no" you just finished and will take too long. Or Sometimes "no" means no.
I once had an amp girl tell me "no" when i asked to french kiss her. On a return visit she tongue me down like a wild women without me even asking. With these ladies. You just never "no"