Naked massage is the technique that leaves towels and wrapping out of the evening from the start, so the night begins without the small choreography of covering up.
Some names on the menu describe a pace and some a material. Naked describes an absence: no towels folded and refolded, no robe, no uniform. The session begins the way it means to continue, and nobody spends the opening minutes managing cotton.
For some it is simple honesty. Towel etiquette belongs to spas, and an evening booked through an erotic massage house is not a spa appointment, so keeping up the pretence adds a formality nobody requested. For others it is about ease: the self-conscious moment of undressing is over before it has a chance to become awkward. And for some it is the whole appeal, the feeling of a room where nothing is being hidden.
Warmth matters a great deal here. Turn the heating up well before she arrives, especially in an old canal house in winter, where draughts slip in around the window frames. Close the curtains properly, since many Amsterdam rooms look straight across a narrow street or a canal into somebody else's window. Leave a bedside lamp on rather than the harsh overhead light.
If the idea appeals and also makes you slightly nervous, that combination is common, and it passes quickly. Some first-timers choose erotic oil for the first visit and naked for the second; others go straight to it and are glad they did. Either way the price matches every other technique on the ladder, and a first booking with the house carries a deposit of half.
Name the technique in the thread along with the time, the address and the length. If you would like it paired with another name, sensual pacing for instance, say so there. The naked massage page describes it more fully, and the erotic oil entry makes the natural comparison.