Siren (2010)

 A relaxing weekend cruise turns into a terrifying struggle for survival in the British horror yarn Siren (2010). When friends Ken (Eoin Macken), Rachel (Anna Skellern) and Marco (Anthony Jabre) spot a glimmering lure on a faraway island, like hapless kittens they are drawn to the shiny object. Sailing towards the island they encounter a dying man; trying to save him, they wreck their boat and are stranded. On the island they encounter the gorgeous and decidedly not dead Silka (Tereza Srbova), who despite seeming confused and disoriented promptly seduces all three of the friends. When the cruisers start having hallucinations starring Silka, they realize that she’s more than meets the eye.

Brunette Anna and redhead Tereza put the “sin” in “siren” when they undress each other and walk nude into the sea for a nighttime skinny dip, providing twice the cheeky peek in the process. Anna also appears in a teeny red bikini in a scene that will have all hands on your deck. Siren will put a spell on you!