TantraThe Sanskrit word Tantra means "continuum" or "flow," and refers to a highly refined science that harmonizes the human consciousness with the subtle and powerful forces at the base of life.

“In the view of Tantra, the body's vital energies are the vehicles of the mind. When the vital energies are pure and subtle, one's state of mind will be accordingly affected. By transforming these bodily energies we transform the state of consciousness.” - The 14th Dalai Lama

Here are some courses, books, and articles to get you started:

Alchemy and Kabbalah in the Tarot
Alchemy and Tantra: Sacred Sexuality
Black Tantra
Candamaharosana tantra: Worship Woman
Gray Tantra
Light from Darkness
Mahanirvana Tantra: Forms of Achara
Mahanirvana Tantra: Kali Yuga
Mahanirvana Tantra: Panchatattva
Maithuna in Tantra Shastra and Veda
Matrimony, Divorce and Tantra
Parsifal Unveiled
Sivananda: Tantra Yoga
Tantra - The Continuum
Tarot and Kabbalah
The Mystery of the Golden Flower
The Perfect Matrimony
The Revolution of Beelzebub
What is Tantra?
White Tantra