Lining the periphery of the room were beds - mattresses on the floor with dark-gray sheets - on which, in a matter of hours, many of these people would be having sex. Many wore costumes: There was a young woman with fairy wings, a devil-angel duo, a trio draped in ivy. On a Saturday night in August, in a cavernous basement in Bushwick, Brooklyn, about 60 people milled around under a ceiling covered in cherry-red twinkly lights.
