There might not be any difference! Lingam refers to the penis, which is a major focus in my massage but more than half the time I wll be touching other parts of the body so perhaps a tantric massage may be a better description for the service I offer.
My service is one way not mutual so should not be confused with tantric sex.
But what is tantric sex. Well yes the session might last longer than a quickie sex session but the “tantric” term really refers to the mind set that we bring to the session. That mindset is concerned with respect and reverence for the whole body and for the experience of touch.