What are the differences between the Kama Sutra and Tantra?

Tantra is a form of yoga. Tantra is a spiritual practice through which the lovers seek the direct realization that they are God and Godess—in the Indian pantheon Shiva/Shakti. Some Tantric practices, but certainly not all of them, include sacred sexuality. Kama Sutra sex is not sacred sex, not a spiritual practice, it is just great sex. Tantra, at least in its oral tradition, pre-dates the Kama Sutra by several thousand years. Both Tantra and the Kama Sutra originated in India. They also both emphasize similar sexual techniques such as slowing down, extending the lovemaking for long periods of time (over a course of hours, not just fifteen minutes), mastery of breath, men delaying ejaculation, etc.