The Kama Sutra of Vatsyayana - Vatsyayana, Richard Francis Burton (translator)

This is a sensitive exploration of the joys and pleasures of physical consummation. The Kama Sutra has often been described as "the first sexual manual", but the original Hindu script has a strong religious basis, and highlights love in all its forms.

https://www.amazon.co.uk/The-Kama-Sutra-of-Vatsyayana/dp/B004KMK3WY