Gilbey’s Gin (Time, July 5,1971). Rumored to have “SEX” Airbrushed into the Ice Cubes

Also appeared in several other magazines that month (e.g. July 9, 1971 Life). Believed to have started various rumors regarding suggestive images airbrushed into ice cubes in beverage ads.
The supposed letters are visible positioned diagonally in the topmost ice cube. (Somewhat clearer in the original image.)