Allow me to boil down the entire marketing strategy for nearly every alcoholic beverage company in the 1960s-1980s: Babes Sell Booze. Whether it was beer or tequila, the selling tactic of choice was almost always this: have a hot model in the advertisement - end of story.
"HE WAS WEAK. SHE WAS WANTON" - the tagline sums it up perfectly; the story is almost always the same: she's the tempter, he's the tempted. Let's have a look at some paperback covers featuring those misbehaving missus (and sometimes misters) of yesteryear...
No concept has been used to compose pop culture art more liberally, with such wild abandon, as the amazing A-Frame. We all recognize the arrangement: a man or woman's legs are spread apart, and it is through this gap that we see the subject.
Eyeful was a men's magazine that aimed to "glorify the American girl". In 1949, American adult oriented magazines were innocent by today's standards - they were harmless fun, employing a cheeky form of risque.
In the 1960s-1980s, if you wanted to sell your record, the most reliable method may have been to simply put breasts on the cover. It was a variation on the "sex sells" approach - you might call it "chests sells".