“The dried root and lower stems of this South Pacific Island shrub were usually chewed and fermented with saliva and coconut milk for ritual and ceremonial occasions.
A mild narcotic, the sacrament generated warmth, camaraderie and tranquility.
Nobles used it socially for pleasure, the priests for ceremony and the workers for relaxation. Kava-Kava was also used to enhance psychic powers, to communicate with ancestors, increase inspiration and to assist contemplation.
… Kava when chewed on, is an excellent stimulant for study (and dancing).
When consumed in large doses, Kava seems to assist photographic memory for a short time.
Kava is often referred to as an aphrodisiac for the delightful numbing tingling sensations it may arouse in the genitals.”
(from “Happy High Herbs” – the book by Ray Thorpe)

https://en.wikipedia.org/wiki/Kava_kava