The MP texting you to come see her at work is their form of advertising. Nothing more. If she invites you to see her at her home, gives you the cell number that her friends have (these girls all have a personal and a work phone), gives you her real full name, and stops taking money from you, then and only then gave you crossed the line from customer to more. I often have gotten 3 of the 4, but still leave cash when we are done. That is the best of all worlds. You actually have a real-seeming sort of thing away from the industry but by still keeping it transactional there’s none of this nonsense of a real relationship so no strings and nothing owed emotionally.