If you invent a punting persona then don't make your fantasy job useful in anyway - telling then you are a plumber for instance, will lead to you having your head in the sink cupboard to sort a blockage for her..!
I am sure a lot of the idle questions are just time fillers though some might have ulterior motives. Asking if you are married may be a simple case that the girl feels safer with married males as those have more to lose than single males - and are less likely to become stalkers or leaches...You can always use it to your advantage anyway - "The missus never gives me a blowjob and I used to love them" (if you can manage a tear in one eye so much the better
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If you invent a persona then try and keep it more accurate than the prossie's alter ego, which changes changes from visit to visit, as does her age etc.,