What a great idea for a thread!
I nominate "(When We Get) Behind Closed Doors". I have always hated that song. Yes, I admit it, I'm a prude, but I always felt that song was a watershed moment in turning the US into a proud nation of sex maniacs.
For a female vocalist I'll go with Cher's "The way of love".
All of the country music songs of this era were about sex. My dad hall all of the Ray Price, Conway Twitty, Tom T Hall stuff. It was all about lovin' and cheatin'.
That's all Conway could sing about.