The golden shower was a practice already in place in ancient Greece (One also wonders if there are practices that were not already in place in ancient Greece.) And did you know that the prostitutes of ancient Greece (at least those who practiced this kind of game) had prohibition of eating asparagus because of the bad taste that it gives to the urine?

In mythology, Zeus wanting to seduce Danae and knowing his particular inclinations, he pissed on her, some translators stuck then turned his golden shower in a shower of gold.

There is also the use of the golden shower in old books in Japanese that recommend to stay healthy, a little glass of piss in the morning at sunrise, and that's for the day. All text related to this practice is called the urotherapy.