"Celibate (single) people should transmute their sexual energies with Pranayama.

"Married people (husband and wife) do not necessarily need to practice the breathing exercises, since Pranayama is condensed for them in the practices of Sexual Magic." - Samael Aun Weor, Kundalini Yoga

Transmutation is facilitated by the Divine Mother. Mantras focus energy and add influence, but can do nothing if the couple is not working with the consciousness and in harmony with the Divine Mother. In other words, transmutation is based on the conscious merits of the heart.