In the 1960’s, a golden tan represented health, wealth, and beauty. It was part of the look of the decade. But like much of the sixties, status quo was questioned. Was the yearly quest to get a sun tan healthy?
This article from the May 1964 edition of Vogue magazine discussed health and the sun. It referenced a study that suggested that sun tanning was not a good practice.
Like with smoking, popular culture won out over science or common sense. The editors at Vogue dismissed the science and justified the quest for a sun tan.
It does, however give some sun tanning best practices in an era before sunscreen was mainstream.