There are many forms of Tantra massage. This can lead to confusion. What is a real Tantra massage? I think one should not try to define it too closely. Instead let's look at what are the possibilities.
First off, Tantra massage at its origin is spiritual in nature. Many escort agencies offer tantra massages which have lost that component and are simply sexual.
Some tantra massages practiced by certified experts focus solely on the genital area, such as the Lingham and Yoni massages. Lingham is the Sanskrit word for penis, Yoni for vagina. These two massages are meant for clearing and releasing blockages in those areas that can arise from emotional, mental or spiritual trauma. They help to get the energy (prana) flowing through your body.
Many women, for example, are not able to orgasm consistently or just never do. Some women experience pain during sexual intercourse which hinders greatly their ability to feel pleasure. The Yoni massage addresses these issues specifically. Their intention is not to give sexual pleasure, but it can be a side effect.
Another type of Tantra massage involves nudity of both the giver and the receiver, but entail no massaging of the genital area. The intention is deep connection, heart opening, bliss, energy flowing through the body. It is a kind of meditation, a time to connect to a higher consciousness, and comes close to a spiritual experience when done correctly.This type of Tantra massage is taught by Johan Raaimakers. I have personal experience with this Tantric Masseur and have also taken his massage courses. He is highly recommended, skilled and trustworthy in the Tantra community:
https://www.tantra-atma.nl/
Johan Raaimakers is based in Holland but travels worldwide for massages and teaching.
This website has a beautiful poetic explanation of Tantra massage:
https://tantra-integral.com/post/le-massage-tantrique-est-une-ode-a-la-delicatesse-et-a-la-connexion-11169/