There is absolutely no discernable reason whatsoever that this family should be naked. There's nothing on this album that would in any way make this cover seem appropriate. Enoch Light is basically an easy listening band leader with no business putting a nude family on the cover of his album of movie themes! (but I love it anyway). Chalk it up to the age of streaking.
That poor little kid. I'm glad they had him looking up - a look down into daddy's lap could've been a little traumatizing. I remember the gym locker rooms as a kid - a bunch of hairy old geezers walking around with their sagging ball sacks on full display. Put a towel on for chrissake!
Interesting that they thought to put the "this album is rated G" text on the front. In other words, nevermind that there's a man and woman butt ass naked on the cover (we did that strictly for album sales), the record is safe for the whole family to enjoy!