The word is often left unexplained, which does nobody any favours. Lingam is Sanskrit for a mark or a sign. In the language of massage it names the male body, and a lingam massage is the slow tantra session as it is booked by a man.
That is the whole of the definition. What follows is the part that actually matters, which is how the work is paced.
Why a borrowed word instead of a plain one
A fair objection: if the meaning is plain, why not use a plain word. The answer is that the available plain words all point at a goal, and a goal is precisely what this format is arranged not to have. The borrowed term is vague in a useful direction.
We are not claiming the word gives the practice authority, and no one here trained in a tradition that owns it. It is simply the least misleading word in circulation.
How the session is actually shaped
A lingam massage opens with a long stretch of full-body work, and that work is not a preamble to be got through. It is most of the session, and the passage of time is doing something: it is the reason the whole hour registers differently than a quicker massage would.
Contact stays distributed. Hands do not station themselves. The pace is set deliberately below what is expected, and it stays there even when it would be easy to lift it, because lifting it converts the session into something with a destination, and a destination shortens everything that comes before it.
There are pauses. Newcomers often read a pause as a mistake, or as a question they are supposed to answer. It is neither. A pause is part of the pacing, and it is usually the most useful part.
What is not expected of you
Nothing is required of you. There is nothing to accomplish and nothing you can fail to do, and a quiet session is not a session that went wrong.
This turns out to be the point that most changes the experience for people who have booked something similar before and found it oddly pressured. Remove the requirement and the hour becomes a different hour.
Practical matters
Your therapist sets her own limits and tells you what they are, in plain terms, before anything begins, and they hold for the whole visit. You can ask her to slow down, leave something out or stop at any point without explaining yourself, and she will not treat that as a problem to be solved.
On duration, we are direct about it: an hour is short for this. The format depends on the long general stretch, and an hour compresses that stretch to the point where the whole arrangement stops working as designed. For lingam work ninety minutes is the honest minimum; two hours gives it obvious room. The full ladder, including the overnight format for one client over eight hours, is printed in every profile among the therapists.
Everything is outcall, your hotel room or apartment, anywhere in central Amsterdam, with arrival in forty to sixty minutes once a booking is confirmed. Schiphol airport hotels are available by arrangement, on enquiry. If you want the wider context before choosing, the tantra massage page explains the manner of working that this format sits inside.