Escort in Prague / The basics. First time.

So, I am going to be in Prague in a couple weeks. I have never had sex before (I'm 21) and I want the first time I do to be in a non-judgmental setting, so I am going to take advantage of the available services in Prague. I want a girl who is physically attractive and will really take the lead in the whole thing. "Show me how it's done", if you will. How do I find what I'm looking for? Suggestions?