Whip It Real Good: Album covers we have loved and lost

Horatio writes: The Olivia Newton John post got us a-thinkin'. Which is the sexiest album cover of all time. There is, of course, an objective answer to this question. Which album cover did we knock-one out to most often? Here are five below that I spent a not inconsequential amount of my youth relieving my urges to. We would LOVE to hear yours. For added interest, two of these albums were in my father's collection. Your call as to which.