Is there really no such thing as waterproof sunscreen?

That's true! However, there is water-resistant sunscreen that can be quite helpful. I recommend picking a water-resistant sunscreen, because the FDA has disallowed the use of the term “waterproof.” Swimming and toweling off are just other ways to wipe your sunscreen off – water-resistant can last a lot longer at the beach. But truth be told, there's no product that now is allowed to call itself waterproof!