Done it a few times, usually go out for foods and drinks, or some kind of activity, nothing unusual or sexual, unless the girl initiates. Really up to the girl, some might lead you on, because they're too afraid to say no, because they think they might lose your repeat business, but you just gotta take the hint if that's the case and leave it be. The times you do score a date, be a gentleman about it. You should figure, they're providers for a living, doubt they care to do it on their off day, they probably just want some normalcy. They might be grateful in return.