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Let the games — and the wild, drunken sex and debauchery — begin! In the run-up to the 2012 Summer Olympics, which kick off July 27, a new book reveals just what goes on at Olympic Villages worldwide — and no matter the host country, it’s always a struggle keeping booze and condoms in strong supply. According to the anonymously authored exposé “The Secret Olympics” — written by a former British competitor — organizers supplied 70,000 condoms to athletes at the 2000 Summer Olympics in Sydney, Australia. The stockpile ran out in a week.

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While alcohol and drugs are banned at Olympic Villages, competitors often fill water bottles with booze and smuggle in weed and doping agents. “When I’m there, I’m in two different gears,” says one female US Olympian, who spoke to The Post on the condition of anonymity. “I’m so focused that I see nothing else, or I’m partying my butt off.”

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While officials don’t condone such behavior, they don’t condemn it, either — the only thing that matters, say those who spoke to The Post, is that the image of the Olympics remain unsullied. Or, as the anonymous author writes: “What happens in the Village stays in the Village.”

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Olympic Villages are vast, pre-fab communities, divided into smaller subdivisions by nation. The United States’ area has a 24-hour McDonald’s, as well as sponsored beer halls: a Budweiser House and a Heineken House. Everything is free — including the unlimited supply of condoms, stamped with sports-specific logos. (Curlers, for example, get wrappers stamped with little curling stones.)

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“At the Olympic Village, they call it ‘Days of Glory,’ ” says the female athlete. These are the post-competition attempts to fill each remaining day at the Village with as much alcohol-drenched sex as possible.

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“You stay up all night and party, and you wait for McDonald’s to start serving breakfast at 4:30 in the morning,” she says. “You eat, sleep, then get up at 9 or 10 a.m. for press, and then you start partying all over again. Two years ago, it was Day 6 or 7 [of partying] for me, and I was like, ‘I quit.’ And they were like, ‘You call yourself an Olympian?’ ” She rallied.

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