The Wynn(WYNN), MGM Mirage(MGM) and Las Vegas Sands(LVS) hotels in Sin City won't be skimping on adults-only pools, despite the deep hotel depression. Some credit the trend to Mandalay Bay's beach-wave pool and Moorea Beach Club, which brought European-style sunbathing to a mass audience. Others insist it was the weekly Hard Rock pool party called Rehab, a margarita-induced bash of muscle dudes and girlfriends who don't mind the occasional waterborne chicken fight.

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