According to Wikopedia:
Tantric Sex is the modern, western variation of tantra often associated with new religious movements. This includes modern Western interpretations of traditional Hindu and Buddhist tantra. Some of its proponents refer to ancient and traditional texts and principles, and many others use tantra as a catch-all phrase for “sacred sexuality”, and may incorporate unorthodox practices. In addition, not all of the elements of Indian tantric practices are used in neotantra, in particular the reliance on a guru. As the interest in Tantra has grown in the West, its perception deviates remarkably from the original Tantric traditions. It was seen as a “cult of ecstasy”, combining sexuality and spirituality to correct Western repressive attitudes towards sex in the 1950s and 60s. Hence for many modern readers Tantra is now synonymous with “spiritual sex” or “sacred sexuality,” a belief that sex should be recognized as a sacred act capable of elevating its participants to a higher spiritual plane.
Margot Arnaud, author of dozens of books including the Art of Everyday Ecstasy, and the Art of Sexual Magic, today is of the opinion that sex is a limitation… awakening or enlightenment means transcend of all which is fenomenal, temporary and transient.
It is obvious the subject of Tantric Sex is both complex and a mystery, and this lends itself to many interpretations as to it’s meaning. The pursuit of sexual pleasure is one thing; and while tantra can be a vehicle to reach higher states of ecstasy and understanding, scholar Hugh Urban warns us:
Since at least the time of Agehananda Bharati, most Western scholars have been severely critical of these new forms of pop Tantra. This “California Tantra” as Georg Feuerstein calls it, is “based on a profound misunderstanding of the Tantric path. Their main error is to confuse Tantric bliss… with ordinary orgasmic pleasure.