I would say being honest and letting them know your intentions would be the best. By doing so, no one is offended. If she likes you she will probably say yes, if she does not, then all you get is a no - which should be fine as well.
But remember folks, most of the time this can get very expensive i.e you will end up paying more than you will pay for a high class escort just for some little fun :butt:
Enjoy xoxo