I'd use a condom, first of all.
Second, here is a list of all the things not to do:
Eat the pussy, eat the ass hole, kiss, drink any kind of bodily fluid from said whore, share drink, share any food, share anything, suck toes, suck tits (only if you have properly inspected them for abrasions is it ok), leave wallet in a hidden place, don't try kinky shit.
She knows that all she is, is a walking house for dick; treat it as that. Just fuck her and tell her to GTFO. Don't get all personal with her, shes a slut. She has had it beat into her that she is just a cock rest.
And last but not least: CUM ALL OVER HER!