You Make Lovin Fun?

Today I heard the Fleetwood Mac song You Make Lovin Fun for the umpteenth hundred time but this time for some reason the words struck me funny. Isn't "lovin" supposed to be fun? It would be more remarkable for a song to have the lyrics "You make lovin feel like work." Or how about "You make lovin feel like a burning sensation when I urinate"?

You can tell a girl wrote the song.