A stunning, velvety-voiced crooner who drew raves from Walter Winchell and Cole Porter, Jan Welles was perched on the brink of stardom, when she faced an impossible choice: deny her lesbianism or abandon the career she had worked a lifetime to achieve. Ranging from the dazzling lights of Broadway to dusty bullfighting rings in the Dominican Republic, flings with Lana Turner and Paulette Goddard to an attempted rape by