This Whisper from March 1955 features a striking cover image and the teaser at lower right: The Story the Whole Town Is Whispering About. What story was that? Seems Whisper had discovered key parties, a type of sexual swapping where men placed their keys in a hat or bowl and women blindly grabbed a set and went home with the person whose keys they chose. The phenomenon is generally associated with the 1970s, and has certainly become more widely known since the novel and movie The Ice Storm featured it as a central plot device, but there are many who doubt such parties were real. Here we have proof that the idea (if not the practice) existed in 1955.
Hah hah, this is so much fun. Wait—what do I win again?