In her book "Tantric Sex" (1999), Cassandra Lorius writes:

"The essence of Tantra is a relishing of earthly experience for the experience of divine bliss it can bring us. Sexual pleasure is used as a gateway to divine bliss, and sexual relationship is considered one of the fastest ways of reaching enlightenment. It's certainly the most enjoyable!
If your passion for life has been stifled within a stagnating relationship, an over-focus on mundane necessities or too much work, Tantra can help you to regain your zest for life, as well as take your relationship to new levels of love and connection. Tantra is a potent means of transforming your relationship---although, if your relationship has cracks in it, putting more energy into it will only expose the weaknesses! Tantra can make your relationship more alive and vibrant, more fun and sensual, and move you out of stagnation by showing you where and how to put energy in. The starting point of this process is to reaffirm the place of SPIRIT in your life, and embrace spirituality in your sexual relationship. Essentially, Tantra encourages you to honour your relationship as a mirror of the divine relationship between Shakti and Shiva, the primordial couple in Hinduism, and to honour your partner as a mirror of yourself. Both you and your partner are divine, and seeing each other in this light helps you move out of petty squabbles and power struggles into affirming the fundamental strength of your inter-connection.
Tantra sees your connection as a meeting of divine energies, rather than of two ego-bound psyches destined to act out past patterns and ways of relating that stem from your family background...Tantra teaches you how to unlock the energies within yourself and to use them to transform your experience of the world into one of BLISS...."