As can be seen here, oral evocations are inherently powerful and are used prolifically in Tantric practices. These are the sound lam in the sex center, vam in the assimilation center, ram in the navel center, yam in the heart center, and ham in the head center. In Tantric rites devised to awaken the Kundalini Shakti and guide the potent evolutionary energy through these five principal Chakras, these five seed-syllables are used. They are evoked at each of the centers. The whole procedure of awakening and channeling the Kundalini energy is a mystical process, not a physiological one.
Tantras teach different methods, some of which are closely guarded secrets.
The identity, however, of the five primary Chakras and the seed-sounds used to evoke and transform the Goddess energy at each of them remains consistent. These are easily accessible truths that can be applied in a straightforward manner, with just enough mysticism to make spiritual sex interesting rather than mechanical. The fivefold correspondences aid the process of self-realization, steering the raw sexual energy through the various stages of refinement down the Tantric path. These correspondences help focus the mind, help structure and organize the normally disorganized, and by the powers of resonance, speed up the evolutionary process.