"Eureka!" exclaimed the ancient Greek mathematician Archimedes when a bathhouse dip inspired his groundbreaking work on the laws of buoyancy. 2000 years later, however, when one is, say, applying his principles during a late night skinny-dip sesh, one is likely to be thinking more about Showgirls than the scientific discoveries of classical antiquity. And that's just fine by Premiere. From Burt Lancaster and Deborah Kerr's adulterous roll in the sand in From Here to Eternity to Jessica Alba and Paul Walker in the considerably less iconic Into the Blue, we present 13 celluloid couples engaging in various forms of aquatic acrobatics. Eureka indeed.