In the “connoisseur” terminology YMMV (acronym for Your Mileage May Vary) refers to a service provider that may offer mixed experience depending on her state of mind or client’s physical appearance or attitude.
Even though I put a lot of energy in order to offer the best experience for each of my clients, I discovered that sometimes is just not working. There’s simply no chemistry involved between me and certain types of people. This is the reason I decided to stop seeing people of Asian, Indian or African (brown or black people) descent. I work best with Caucasian (Europe/USA), Middle Eastern and North African type of people.
You will save both my time and yours by letting me know your origins from the beginning of our conversation prior to a meeting. Also, in case of my unavailability you will have plenty of time to search a suitable escort in Amsterdam.