Donkey Punch (2009)

Synopsis
A luxurious yacht floating in the Mediterranean serves as the unlikely setting for this tightly wound horror-thriller concerning three vacationing ladies whose carefree vacation morphs into a picturesque nightmare over the grueling course of one terrifying night at sea. It began as a fun night out on the town, but after meeting three charming locals at a nearby club, the gorgeous vacationers made the fateful mistake of joining the men for a hedonistic party at sea. Unwisely climbing aboard the borrowed yacht with the libidinous strangers as the sexual tension becomes palpable, the girls realize too little too late that their most recent misstep could very well be their last after a freak accident claims the life of one, and the argument over how to handle the situation leads to a vicious struggle for survival. ~ Jason Buchanan, All Movie Guide