The Kama Sutra
It is persistently confused with Tantra in Western usage, though it is not a tantric text at all. The famous nineteenth-century English translation credited to one man was substantially the uncredited work of two Indian scholars — an attribution problem datable to a specific 1883 printing.
Vatsyayana's Kamasutra (c. 2nd–3rd c.); the 1883 'Burton' translation, substantially by Bhagavanlal Indraji and Shivaram Parashuram Bhide
An ancient Sanskrit treatise on the art of living well, of which only a small portion actually concerns sexual technique.