HFH - Afternoon Delight
The best version of this song was Anchorman's a Capella rendition.
For such an adult contempo song, this sure has some raunchy lyrics.
It was the 70s -- fern bars were all the rage and AIDS had not yet surfaced.
And the college glee club wouldn't only have sex between classes, they would also write a song about it.
They were probably listening to Baby, I Love Your Way whilst making WHOOPEE.