Tom:
Good idea, on the beach. Turn it into a reality shoot: guy and gf on the beach, snuggling, but she's shy. So he blindfolds her and once she can't see, she's game. Just when he's pumping away, along comes this dude on tip-toe, and joins in. Then the next, and so on, and pan to a whole line of guys waiting their turn
Edit:
Caption: Revenge. After the argument, he takes her to the beach for a romantic picnic to make up. What she doesn't know, is that he's still pissed off, and has invited the whole football team along.