1. Into the Blue (2005)
Alright, I might have cheated with this one, but look at the pair on Paul Walker eh? Any film whose plot can be contained in the phrase 'underwater action-adventure' is likely to be in trouble ("Hey! It's like a heist gone wrong film, but in the sea") so you need a good selling point. Sadly, the 'dream' pairing of Walker and Jessica Alba are as damp as the film's setting. But, when you've got actors that look like they do, simply stick one of them in a bikini and you tell the bloke to take his top off and you're marketing will do the job for you. That's the theory, sadly it never quite made it's budget back and the film sunk without a trace. Still, a quick google search reveals they made an entire calendar out of beach shots - so all that flesh didn't go to waste eh?