Orgasm, if it is attained during a tantra lingam massage, is at best to be considered a happy incidental event.
It is not only the shaft of the penis itself that is massaged during a lingam massage. The massage should include the perineum, as well as the testicles and prostate. Contrary to common belief, the experience is not always something that an uninitiated man is entirely comfortable with. This is especially true if the man is typically focused on performance, since a tantra lingam massage is not about male sexual performance but about surrendering to passive, externally applied pleasure.