Tantric massage perspective
The Sanskrit word for the male sexual organ is Lingam and is loosely translated as “Wand of Light.”
Orgasm is not the goal of the Lingam massage although it can be a pleasant and welcome side effect. The goal is to massage the Lingam, also including testicles, perineum and Sacred Spot (prostate) externally, allowing the man to surrender to a form of pleasure he may not be accustomed to. From this perspective both receiver and giver relax into the massage. Men need to learn to relax and receive. Traditional sexual conditioning has the man in a doing and goal oriented mode. The Lingam Massage allows the man to experience his softer, more receptive side and experience pleasure from a non-traditional perspective.
In the video below a complete back massage is typically done before the front body. In effect the entire body is treated to create a balance and the lingam is massaged with focus near the end of the session. An observation is that this is a technical representation. The couple seem to be energetically disconnected although the guy no doubt feels nice. But this is not exactly tantric.
A Hegre art video