SANAA (AFP) - Yemen's opposition held mass protests Monday, escalating demands for the immediate departure of President Ali Abdullah Saleh after the ailing leader said his future should be determined at the ballot box. Tens of thousands of protesters marched in two demonstrations, one for men and another for women, from Change Square, epicentre of anti-regime protests which have rocked Yemen since late January. In Taez,, hundreds of thousands marched from Jamal Street to the protest encampment at Freedom Square. Mohammed Qahtan, spokesman for the parliamentary Common Forum of opposition parties, said Saleh clearly had no intention of quitting. "Saleh has shown in his address that he is still clinging to power, and that he refuses the Gulf initiative that provides for a political transfer," Qahtan said.