Dunno what else to call it. I'm still fascinated by this stuff but as far as I know there isn't an easy way to wade through the commercialized "neo-Tantra" stuff. To try to remedy that I'm going to make a list of scholarly sources. Naturally, then, these won't be pragmatic. But I hope this will help people who shy away from this whole subject because of the commercialization.


Taoist
Art of the Bedchamber The Chinese Sexual Yoga Classics Including Women's Solo Meditation Texts by Douglas Wile

Hindu Tantric
Kiss of the Yogini: "Tantric Sex" in its South Asian Contexts by David Gordon White
The Power of Tantra: Religion, Sexuality and the Politics of South Asian Studies by Hugh B. Urban

Buddhist Tantric
List of Essays on Sexuality by Keith Dowman
Passionate Enlightenment: Women in Tantric Buddhism by Miranda Shaw

Western esoteric, occult
Hidden Intercourse: Eros and Sexuality in the History of Western Esotericism by Wouter Hanegraaff
Magia Sexualis: Sex, Magic, and Liberation in Modern Western Esotericism by Hugh B. Urban
The Secret History of Western Sexual Mysticism: Sacred Practices and Spiritual Marriage by Arthur Versluis
Eros and Magic in the Renaissance by Ioan P. Culianu
Moshe Idel -  Kabbalah and Eros

Sufi
Mysticism and Sexuality in Sufi Thought and Life by Valerie J. Hoffman-Ladd
Themes of 'The Erotic' in Sufi Mysticism by Jonah Winters

It is said in the old books the Buddha taught:

(1) a husband should serve his wife;

(2) upon being served, a wife should (conditionally) return her love;

(3) a husband should grant his wife authority in the home (thus also in the bedroom); and

(4) a woman's ideal towards a man is domination. 

This sounds like Tantra, surrendering to a woman until a man clearly discerns her needs, wants & natural morality.