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In practice, this is a well-intentioned piece of bureaucracy. In reality, it's something nobody is ever going to read. But my relationship code is based on respect and concern for a partner's wellbeing.
I guess this piece of advice is dependent upon how you behave when you have a special person in your life. I'm going to assume that you're a decent sort, and that your relationships to date haven't been a shitstorm of domestic abuse, neglect and psychological cruelty. If you wouldn't treat a girlfriend that way, don't treat a prostitute that way. These are basic people skills. Would you like it if a stranger stared at your half-naked body for an extended period of time while deliberating whether they wanted to put their penis inside of it?
Instead, make your mind up and make the first move by tapping gently on the window. In your head, that price probably accounts for a minute or two of fellatio, followed by penetrative sex.
You might already be in the room where the business is going down, or you might have to walk to a room at the back of the shop. You might also have to go up some stairs, or you might have to go down some stairs. Regardless, etiquette requires you go first.
I guess this is as applicable in everyday life as it is in a brothel, but try not to come across as a risk. That sentence alone should tell you this is not good etiquette. This is as much a pay-up-front environment as it is a pay-as-you-go environment. Malcolm Gladwell wrote a book called Blink. In it, he posits the idea that experts can make accurate assessments — which should otherwise take hours or days of detailed analysis — in the blink of an eye.