Back in the 80s, spraying behind the knees was also mentioned in fashion magazines, because as fragrance tends to rise, a lower point of application helps to cover more of the body in a subtle way.

I wonder why that perfume tip disappeared?

Yes, but only after electromagnetism had been tamed like fire was!

Does religion play into this?

In “middle America”, it’s the church that has usually lured well-meaning women into believing they are under siege, in peril like never before in the history of mankind. Same thing happened to my mother starting in the 70s with snake oil salesmen like Jerry Falwell, Jim Swagart, Jim Bakker and Pat Robertson.

The non-stop message is that they are always under attack, it’s always the end of days, the antichrist is always already among us, The Rapture™️ is just around the corner, and they are the chosen ones… living in constant fear of the fairytale boogeyman and calling it a privilege, their minds have been shackled and atrophied by a state of perpetual red alert that Satan is everywhere, that their loved ones will spend an eternity in hell.

EDIT: tweaked a sentence for clarity