These source materials appeared between 1960 and 2000 CE.
Making Love: Sexual Love the Divine Way by Barry Long (1998)
Art of the Bedchamber by Douglas Wile (1992)
Sacred Sexuality by Georg Feuerstein (1992)
Interbeing: Fourteen Guidelines for Engaged Buddhism by Thich Nhat Hanh (1987)
Aghora: At the Left Hand of God by Robert. E. Svoboda (1986)
Taoist Secrets of Love: Cultivating Male Sexual Energy by Mantak Chia (1984)
Sexual Force or the Winged Dragon by Omraam Mikhaël Aïvanhov (1982)
Tantra: The Secret Power of Sex by Arvind & Shanta Kale (1976)