When the call came on his cell phone, Roberto Hernandez was driving to work in San Francisco. The caller, who identified himself as Juan, said in Spanish that he had met Hernandez at a gay bar and wanted to see him again. "Refresh my memory, there are so many Juans," said a puzzled Hernandez. The man described himself as slim with "a very nice butt." Eventually, the caller offered to give Hernandez his phone number -- then announced that the conversation was being broadcast live nationwide on the "Raul Brindis and Pepito Show," a Spanish-language morning radio program. "Why did...