The Goddess Kali
When Tantric sex practitioners talk about “the Goddess”, the Goddess they are referring to is Kali, the supreme deity of Hindu Tantra. Kali represents female empowerment or Shakti, and many Tantrikas refer to Kali simply as “Shakti”.
Kali is often depicted standing with one foot on the supine figure of her male consort Shiva, or—as in this great image I found on Facebook—riding him in sexual intercourse. The God’s erect penis, the sacred lingam, is shown penetrating the Goddess’s yoni. The imagery clearly depicts the Tantric belief that female energy is active and dominant, while male energy is passive and submissive.