19. A leased out his condominium unit for 10 years for PHP 50,000.00 a month. Meanwhile, A harbored his mistress X in his house while his wife, B, was in the United States of America. Subsequently, A donated to X the right to receive all rentals from the lessee of the condominium unit. B filed an action to declare the donation void as it was made between A and X who are guilty of concubinage. In their defense, A and X claimed that the action should be dismissed since the crime of concubinage should first be proved in a separate criminal case. Decide with reason(s).