Sacred Sexuality's Modern Invention
A detailed scholarly history has shown how little of this actually comes from Indian tantric source texts at all. It was substantially built by named nineteenth- and early-twentieth-century American and European occultists, developing their own sexual magic practices largely independent of, and later retroactively attached to, genuine Indian tantra.
Hugh Urban, Tantra: Sex, Secrecy, Politics, and Power in the Study of Religion (2003)
The Western tradition of ritualised sexual practice as a spiritual path, widely marketed as an ancient Indian discipline.