Mongering is 100% transactional. It’s the simplest form of economic activity: a service is for sale, you pay an agreed price. If the service is not provided then you are entitled to get your money back. All the rest, all the awkwardness, embarrassment, guilt…whatever else you feel, is your emotional baggage of which the seller takes advantage. Always got to remember that prostitution is legal. If you don’t get what you pay for then the provider is at fault. Of course, you need to negotiate with respect and awareness of the health and well being of the provider. You too, can’t take advantage of their emotional vulnerability just as they shouldn’t take advantage of yours. Just be honest and open with your expectations: you are there for relief of your sexual tension. She is selling her service as a reliever. That’s all. She doesn’t expect anything else nor should you.