Any time there's a lethal mix of alcohol, sofas, a seemingly attractive crowd (it's dark in there, after all), pulsating laser lights and a thudding techno beat -- as there is at XO -- hooking up is bound to happen. Making out with a total stranger is easily accomplished at XO, thanks to a cavernous interior with five rooms and labyrinth-like structure. And if fleeing must be done, these same factors are just as effective in befuddling any ardent pursuer.