The title scene, featuring "Grandpa" and a buxom Latin strumpet lustfully humping one another, is a hoot. Not only is it amusing to see the cradle rocked so furiously, these two have chemistry. She's quite exotic and attractive, and he's well into his autumn years. This scene has stroke value and novelty value.
The other three scenes run like deleted scenes from Tod Browning's Freaks. The scenes featuring midgets, immensely overweight women and non-performers are a let down after the kick-off scene. At the very least, that 20-minute burst of energy illustrates two erotic issues: It doesn't matter what you look like or how old you are, you can still fuck on screen; and old people are horny, too!