There are only a handful of urges that humans have that are innate. One is the urge to eat and a number 2, sometimes a number 1 would be the need for men and women to have sex.
Sometimes due to age, stress, employment or various other reasons the quality of sex is not what one had hoped for. That time is over with the creation of this secret aztec brew.
This brew was held in secret for only kings and to be utilized by their harem.